From my testing with a dfgt, the steering sense makes no difference. As stated above, the blurb says it affects stick and button steering.
No idea about g25-27
Regarding running lower rotation on a 900 wheel, IMO, it's silly, you are making the steering more sensitive, therefore you have a smaller window for where the wheel can be, for the front wheels to be pointing in the correct direction.
900 might make your arms tired, but nothing beats a lock to lock transition at 900.
If I was drifting a budget drift car in real life, it would be closer to the 900 setting.
I haven't even tried the other settings, I don't care if it makes it 'easier', it's going to be a lot less fun for me. That, and I'm used to 900 now, and getting rather good, even if I do say so myself.
In response to the OP, more throttle, and earlier with straightening the front wheels up, as soon as you feel the rotation of the Inital drift slowing down, you need to straighten the wheels and get the power down, or the only thing that's going to happen, is snap back.
It just takes practice and getting to know the car. Looking for the tiny visual cues about the cars rotation.
You need to get past reacting to the car, and move towards proactively controlling it.
Doing this whilst properly sideways is not easy, it's takes a lot of time with the car, knowing exactly what it's about to do, before it does it, and preempt it with your control inputs.
A good setup that suits your driving style helps a great deal, and therefore setting up the car becomes important. Knowing exactly what each alteration is doing, and if it's helping the issue, or creating another.
I've just built a budget 180sx, around 350bhp with low rpm turbo, and I havent had this much fun on comfort hards for a long time. Why? Because it gives me a lot less to worry about.
Light weight and modest power, with excellent throttle response is what you want. Supercharged ae86s are perfect for learning what's what. IMO.
If your trying to drift an m3 on comfort soft, that's your first mistake.
Don't get me wrong, gripping tyres can be used for drifting, but you have a lot less time to respond to what's going on. And you need lots of power to maintain any worthwhile drifting making it easy to unleash too much power and ruin the little bit of good drifting you had going on.
All IMO of course.