On the advice from a friend who has experience with Glock 32s, I've swapped the magazine springs in the Glock 32 mags for the eleven-coil ones from full-size Glock mags. This is to cure this problem here:
20# ISMI recoil spring. The factory unit is the same 18# recoil spring assembly used in the Glock 19, and you can feel the slide bottoming hard against the frame. I'm going to at least experiment with the heavier spring and see what it does. You'll notice that with the Gen4 guns, Glock introduced a dedicated recoil spring assembly for the .357/.40 guns, rather than just using the 9mm one. I'm filing that under the "clue" column.