uhh...that's crazy!
sorry to hear you endured that, lol.
honestly i barely touch my Makita anymore. and i don't have a Flex! i still use my pre-XP PC!!! i've found that with the Hyper twins and the right pads, i'm getting results that are pretty rapid but without over-correcting. it's somewhat slower but i'm fine with that because i can get right to the point before perfection or on top of it, without going past it and cutting away extra clear for no reason other than speed. plus, no matter HOW soft the paint, i feel the DA leaves the clearest pre-coating finish using the right pad and Hyper polish or Optimum Finish, depending on the paint.
i can't imagine a normal passenger vehicle roof that would take more than a fraction of the time you spent.