The combo should work -- the WH330 we did at over 29 lbs with a smaller 100 (tho not a BME) worked very well.
As for bigger prop improving performance -- don't be surprised if that does not work out as expected . ( and we fly at 4500 ft elev.)
The optimum prop for power may be smaller . Ya gotta try a few .
Oh yeh we were not using canisters -- just JMB mufflers .
Put the combo into competitition against 150 powered models - then you can see how it really compares.
Once you get into looking for serious power in the Unknowns-you get a really fast wake up call --
BTW , a threaded prop center bolt and 6 bolt drive hub suggested for the new engine is in my book a good idea .