I didn't realize you weren't using the pc version, or if you told me it didn't click. I'd bet that's what your problem is.

Here's how Mark Land at Muzzy explains the differences: Thepc version is shorter and lighter to begin with, but more importantly it offers a shorter mounting hole which increases the amount of rest travel and speed to help with the shorter slide travel bows. Actually the 1st hole in thepc arm is the same as the 3rd hole in the standard arm so thepc arm would have another shorter hole to increase travel. It also has the short side plate which gives the extra clearance for the rest hook arm in the shorter position.

I'd be willing to bet you'd be happier if you tried the rest made for those bows... Hope so, anyway.