I'll second this. I used to unplug the power on my DFGT, which disables the FFB while still being able to use it, and it's just night and day experience-wise. It's much harder to find a good steering angle and immersion is definitely not there. Better to use it even if you have to turn it down to start and get used to it.
With that, I definitely agree that FFB is way too high. Admittedly, my T300 just arrived and came out of the box last night but I really felt like I was going to break a wrist the first time I ran off. The adjustment didn't seem to do a whole lot either. As long as it works in the release version I'm good but otherwise I may have to start a wrist/forearm workout regimen!
Ehm.... also the T300 can be used unplugged without FF or it doesn't work? Strange question, I konw