Speaking of Ace and bushings, I just tried this but on Ace 33s:
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How are medium bones bushings on v3 aces
I use one on top only.
...and it's not bad. I mean fuck, I just did it today for one flatground session.
Originally I was using the Ace stock bushings, broken in. Everything was going well, but I noticed that the bottom bushings were riding over the edges of the washers a little bit. Got concerned that that could lead to a problem. Also, I noticed that when I pushed my board out on flat, it would always curve to the left (this is a usual problem of mine). Maybe I'm exposing my ignorance but I figured why not switch the bushings to the Bones medium bushings to see if it does anything.
So I did switch them, but I don't think double-cone bushings work well with Aces. I was previously using the Bones in a pair of Thunders with no issues (aside from the top washer and nut unable to fit on one truck until I gave myself an aneurysm forcing the top bushing down. It eventually worked).
Anyway, the Bones bushings in my Ace 33s turned well but felt unstable. So I decided to give Assflea's suggestion a try. It does feel more stable, and the board isn't curving to one side any longer, but now the bottom bushing is less visible in one truck than the other. Feels good, though. Maybe I just have to tighten the kingpins and everything will be perfect.