I have used 2 different Mejzliks and 1 3W.

I didn't have to drill out any centerholes on any of them. And the engine is a DA 100.

and whidbey1
to answer yor question my data won't be that useful b/c all the props are a different size. I like the 28x10 Mejzlik the best for uplines and downline breaking. The 3W didn't seem to produce as much thrust. It does weigh .25 lbs less though.