I've always run into the issue of crushing bushings after over-tightening them
I bought some bones hards, but they felt too stiff, so i bought some mediums. I thought the mediums were too squishy, so i swapped the bottoms bushings out with the hards, and then tried them the other way, with hard tops and medium bottoms. I ended up crushing one of the medium bushings, so I put the hard bottoms back on with the hard tops, and they feel much better than when I first put them on. I think there is a bit of a break in period, though they advertise there is not.
Just buy some different bushings and experiment.