I think, like Tug said, you have opened up a can of worms. I like to fish so i am going to pull one out. I think that items such as the revolvers and others miss the point of why you need flex. Yes, the revolvers tend to get your tires closer to the ground in certain situations, but without weight on that tire, nothing is gained. Tire touching ground+no weight on that tire=burned up tires. They sure do look good on the ramp though. I agree that Flex is important, but before any of those options, I would look at lockers for the axles. Just my opinion. HJope it helps.
Todd