Dont worry you're not the only one.
I need bigger balls to do EC turn one, on street tyres i can manage 170k's but there's nothing more left to give. Really want to try it on full slicks
If you want the results of those turbos on 3L motors, have a look on www.supraforums.com www.supraforums.com.au and www.mkiv.com. They've got all the results of turbo vs turbo on 3L based motors albeit 2JZ's instead of RB's