I think I'd have called WD (or who ever you ordered from) for a fitment check before I did all that. There are 2 sizes and they don't claim to work with every grip. They say you may need to do some shaving, but not major reconstruction.
Looks and sounds like you got the wrong ring. If you already contacted them, my apology.
Some people go their whole life wondering if they made a difference, Marines don't have that problem.~ Ronald Reagan
2012 XCT, AFR+ Gen 4, Lloydz air filter. I don't equate noise with power.
I ride with the Force.