Jay, I haven't used Menzerna Power Gloss yet. I've been given a sample to try and am keen to, but haven't had the opportunity yet.
I was planning to use it with, at least, an orange light-cutting pad.
I was wondering whether that might be the problem your having. Maybe the polishing pad is too gentle to break down the polish? Power Gloss is quite an aggresive (compared to IP) polish so maybe it needs a more aggressive pad.
Just an idea. :nixweiss