I you bothered to search you would find that there is at least 2 other owners of Evolutions that are claiming 6300 and 6800 on 24/10s one right underneath your post.
Break it in with a petroleum based oil and not the one that came with it... Use Penzoil Air Cool 2-stroke.
The engines are totally bullet proof once broken in, can swing a 26x10 @ 6000 rpm,
Best prop for 3-d on them is a 23x10 bolly, spooling to 7400 rpm VERY quickly.
For imac type flying a 24x10 would be really good
Again thats your quote.
Perhaps if you had followed the instructions and not "broken it" in with Pennzoil which they dont want you to do you would have better luck.
Seems your the only one so far that I can find and I bet they sold more than 3.
Maybe swap it out for a DA which you trashed so well.