I have the Minoura seat mount with 2 Profile Designs cages. I've never launched a bottle. I don't think I've tried to get a bottle out while riding. I use the two frame mounts, too, and rotate the empties to the seat mounts at rests.

Oh, one bit of caution, when you swing your leg over the bike to get on, make sure you clear the bottles! I've missed and made an awkward fall.