I don't know your construction technique neither the EDGE kit (or ARF) you bought but, to me, your weight to surface ratio sounds like very little.
22 lb on 11.5 sq ft, have I understood well? In addition to that you say that the engine provides 50++ lb static thrust, spinning a 27x10 prop @ 6600 rpm (7200 in the air).
Wow, I am just astonished.
My kit is from BETTINI (some of you should know it) and the design should be something around 27% of an Extra 260, as the box states.
I believe the engineers have taken some liberties here. I have put the plane together by the book and, at worst, I could have caused it to be 1 pound heavier than expected.
I have installed a ZDZ 60RV and a wood prop that works it out @ 6500 rpm static (some other members told me that I have to burn a couple of gallons of fuel more before the engine will give out the best).
In short, I have 22 pounds of balsa, ply and foam, ++ on 9.9 sq ft wing (including the fuselage section in between)and I have estimated the engine static thrust to be something around 30 lb.
If I look at your plane numbers I just get to realize that there is something wrong.