I handled the FS Nine at the NRA Meetings in Indianapolis last weekend. I loved the feel of the pistol. The rep said that the pistol has a 5.5 trigger, but like you I found it to be heavier than that. The takeup was spongy, along with the letoff and the reset, while short, was not PPQ or P320 short. IOW, I could live with it.
The magazine body is a 92 series Beretta/Taurus, with another slot for the FS Nine magazine release. This means that the 17 MecGar's could work with a new slot cut and a quick floorplate swap. I don't like the uber big floorplate either, but since it uses 92 series magazines, one could cut the grip down to fit the 92C 13 round magazine and have a slightly shorter pistol (which would be easier to carry).