Funny, when you get your steering super sensitive and you ride someone else's that's not . . . you fall over for no reason because you mind tells you "this" much will turn you, but it doesn't. For that reason alone, I really don't much care to ride other skis. I also have my truning way off to one side, so when I ride someone elses ski I feel like I should be going straight, but I'm turning.
I've always made a plate out of aluminum angle iron that I riveted on the back. I also filled the bottom in with JB weld - I'd turn the nozzle upside down and fill it with JB weld - then you could put a rivet through the back into the jb weld-filled void, or even tap the jb weld and run a bolt or screw through it.
I always moved the steering point forward and in.