Hi Dazzler,
I also built the GP Dazzler a few years back. I had put an OS 40 LA on it with a 10X5 APC prop, with pretty good performance. It just could'nt hold a hover though, but otherwise it flew great!
The next year I wanted to try some hovering, so I replaced my 40 LA with a 46 LA, that was on my trainer. I put a 11x4 APC on the 46 LA and I was able to hover it!! And I'm still able to hover it with the 46 LA and a 11x4 APC prop!
It works fine for me and I wish you good luck with your Dazzler!
Manny, Ohio