RE: Problems getting Evolution .46 to run at more than half throttle
You should find this to be a good engine. The Tower Muffler gave mine around 1000 more RPM and was worth $17. I use Omega 15%. You may want to try the APC 12.25x3.75 prop on the UCD. It should make a very big difference.
Don't forget to change out the glow plug you are using to break it in some more. When you think it is getting smoother go ahead and put a new OS 8 in it.