I just fucked with these stage 4's a bunch and found the stock bushings to be absolutely horrible at 180lbs. Like, no rebound, just totally dead and tight feeling bushings, and I feel like I'm the first to mention that which makes me wonder if I got a bunk set or something. Nowadays even the stage 11 stock bushings are pretty damn good and carvey, but not these.
Anyway, so I grabbed a set of Ace standard medium bushings and the bottoms are actually a couple hairs shorter than the stock Stage 4's. But I have some flat washers that Riptide once gave me when I ordered bushings and they make bushings sit just a little bit higher vs stock cup washers. So it brought them to the proper height. Then just Ace top bushings with no top washers. Totally revived the trucks, the turning is insanely good. I could almost do two full circles in the same spot with all four wheels touching the ground. I do think these might be better than Ace's. Still felt stable on center, even when doing that kinda one foot steering you can get away with on Ace's cause of the twitchy geometry.
TLDR; Indy stage 4's are amazing with Ace medium bushings and seem to turn even better than Ace's. 146's are what I'm on, btw.