Your bike started out as a 790, so the cams are good.
The slides from your stock carbs should work. That may not be necessary if the OEM springs calm down the slide opening, however. That said it would be helpful to know what the air transfer port diameter is. In my experience small holes like that can be difficult to measure with great accuracy.
Try the springs first & see what happens.
The bike should not need 48 pilots; like I said, I think yours has a slide-rise issue as a consequence of FF's tuning, & you need to rule that out first.
