Only driven an mx-5 for a short few spins and on the road so can't really offer much opinion on how yours handles but in terms of giving reason to the extreme settings with toe-out in front and in on the rear would have been mostly to try stop the rear from being too twitchy and make it more stable during corners and drifts and prevent it spinning around.


On any car, you should aim to have balanced grip both front and rear anyway so might be better off trying T1-rs all round and see how it goes.
If it works for you, it'll probably end up being alot better than R888s on the front and lesser grip at the rear.