Hi
I had tire wear problems with a 20" MP3 on my Morgen, and what I did is take 2 20" rims, and bonded them to the cast wheel so I could put a wider tire on it. I went from a 1.25"(about) wide contact patch to a 3+ " contact patch. I have not noticed a wear problem since.
I have no idea if there are wider tires for 16" rims, but Google is your friend....
Please let us know what you come up with.
TTFN,
Dennis