Just to clear up a few things.
I have the PST endlink bushings on the car right now. I have used the OEM, ES, 1LE and the PST bushings. I have seen no difference in performance except that the Poly ones deflect less.
I am using grade 8 blots. I have several lengths and I don't remeber which ones are on it right now but I can check. I have also used several lenghts of sleeves to go with those bolts. Some came with the bushings, some I made myself. Again, Its been a while so I don't remember which ones are on the car right now. I know that they are all different lenghts. As much as 1 1/2 inches different from shortest to longest. I have my car preloaded with the drivers side longer than the passangers side with the thought of compensating for my wieght. This question was asked to see if this preload was helping or hurting and to see if longer or shorter sleeves improved performance.