Ok, I opened it up, futzed with the ribbon cable (the trickiest bit). BUT, the sticks are already at their "tightest", vis-a-vis the springs. They are at their maximum tension, which seems silly - you would think DJI would calibrate it to where you could tighten or loosen the springs at least a bit to taste.
I'm sure someone could probably put new springs in, but I'm not motivated enough at this point to do that.