It must have been me I guess. Could have been overdriving expecting different results. I'll keep at it tonight. Thanks for the feedback.
Yes, it might be just an adjustment period to get used to the RH tires. Gravitron originally felt the brake zones were longer with the RH tires, but based on our runs last night that's not true. The brake zones are almost exactly the same which is convenient as you can use the same braking pionts. The car stops quicker, but you are going a little quicker. You slide less in the corners so a couple corners feel different. You must turn in later in order to be clean in a few spots because you'll stick. Lesmo 2 and the entry to ascari are two primary examples. If you turn in anticipating the SS horizontal slide to keep you on rumbles and clean you will end up cutting the corner illegally. Otherwise I'd say the rest of the track is very similar. You can get on the gas earlier and forward traction is much better without requiring as much throttle control or short shifting. I haven't run until the critical rear left time goes down too far so I don't know if grip falls off a cliff. That's next on the testing agenda.
A couple other general notes.
First, braking zones under draft can be deceiving.
Brake early when behind someone and under the influence of draft. Going into turn 1 you really feel the speed gained from draft and it's pretty natural to break early. You can also brake really early and modulate the brake to manage the distance and end up right behind the other driver at the apex without taking risks. Going into the 2nd chicane is much more deceiving. It doesn't feel like you are going faster, but you really do have to brake quite a bit earlier and the brake zone is shorter. It's easy to miss a brake marker when following so be careful. The braking zone into ascari is the easiest to miss... make sure you aren't just using shadow lines on the ground for your markers because you might not see them. I'm a bit worried about lesmo 2 also sine the brake markers are no longer immovable objects... you might want to figure out an alternate marker just in case they aren't there.
Second, there is quite a pace differential between drivers. I suspect there will be an equally great difference in how drivers abuse the rear tires. It's easy to make a mistake and one touch of the grass can send you in a spin. Add to all of that there may be times when some drivers are on different compounds. Conclusion is that a few drivers are going to getting lapped (and maybe more than a few).
If you are getting lapped you must observe the blue flag. You cannot defend your position and you cannot drag race a lead lap car down the straight. According to the OLR, you must pull over and get out of the way at the first opportunity. And you should be conservative about it and think ahead. If you are heading into the chicane and feel like you will be holding up the lead lap driver by in the middle of the chicane you should pull over before the chicane and let them through. Yes, you are losing time, but once you are being lapped that's your responsibility. Once you let the driver pass you there is nothing against using their draft a bit and maybe get back just a bit of that time, but you have to be careful... before you get to the braking zone back off or pull out of the draft. You don't want to be punting anyone into the sand trap.
Be careful re-entering the track after an incident. We've had drivers in the past make a mistake heading into turn one and ending up on the blocks and return unsafely to track and receive a penalty. Once you are off track you can't get back on track until the coast is clear. Don't dive back into the chicane into oncoming traffic, remember your tires will be slippery and you might have damage. You might have to wait for an entire pack to pass before you can proceed. Once you go off track it's your responsibility to return safely. Once you are back up to speed and on the racing line you get back your rights to the racing line, etc. (assuming you are battling cars on your same lap).
but FINALLY someone else is seeing what I have been experiencing for a couple weeks (it happened during the Audi S1 race). I found that changing any setting after going into Event Settings is not really important...I found that just going in there and then exiting will fix it. When I exit I click Yes, then leave. It will say you changed something, even though you never really touched any options. After you go back into the race and pit, the tires are back as they should be: having all available tires ready to be changed during the pit, not seeing missing options for tires like it was the first time.
but hopefully if I do the little "go in and change nothing in settings" trick it should be fine.
I can't remember it ever not working. I have only seen it when I host a room. No one else in the room has ever said they are experiencing the same issue. I don't remember seeing it when I am a part of someone's room. I will double check these next time I get in the FXX.
If I need to get the car in reverse for some reason I just can't get used to the GT6 system of the tranny staying in R unless you shift. In GT5 it just went back to 1 if you released the reverse button and I wish I could go back to that setup. In the parity race I ended up starting one race from the grid in reverse... sorry Jammy. 
