I don't really skate Aces anymore, but when I did, Ace hard bushings felt absolutely perfect for the trucks. Their stock bushings are really just not that good plus they are too soft and squirrely for most people.
I came from skating Thunders with the Thunder hard 100a black bushings from their rebuild kit, and as a 200lb+ dude I love the Ace Classic bushings; started on Classics then got some hollow AF1s.
The AF1 bushings are too squishy for me tho, didn’t feel as good as my Classics.
Switched them for Ace hard bushings, still no good.
Switched those for Bones medium with flat washers top & bottom, still no good.
Bones hard with flat washers top and bottom, still didn’t feel right.
Put some Ace Classic bushings on my AF1s and all was well with my truck madness…