wow you don't know how helpful this is to talk with someone who is racing. I would forego making my own restrictor if they are available somewhere. Thanks.For toe, I've had success with 1/32" toe out F and the same amount tow in for the rear. As for brake fluid, a good glycol based 5.1 brake fluid will help, but they are pricey. I've used Motul RBF 600 for a few years as it has high heat resistance for a DOT 4 fluid and is readily available at a lower price. For our six-speed trannys, I use Redline MT85 as it has the right amount of friction engineered in to allow syncros to function properly. I use it for my street Z as well. Good luck with your T3 Z- perhaps we'll see you at the Road America Runoffs next fall!