FWIW, I'm flying an old GP Cap21 kit designed for a .40 2-stroke. I have an old OS .61FS in the nose, turning a 13x6 APC prop. Weight RTF less fuel is 6lb-6oz. Wing loading works out to around 27oz/sqft which is a bit high.

When I take off, I roll down the runway quite a ways. The tail comes up almost as soon as I start rolling, but I let it really get going. I gradually increase power until I'm at 100% power. That usualy takes about 150ft or so, since I add power slowly. Sometimes I'll hit a divot (grass runway) and the plane can fly at only half-power, but I keep going straight and increase power until I'm at full and going pretty fast. Then I pull in to a shallow climb.

After I've climbed for a second or two, I then have airspeed and altitude for some low-level tricks, like a roll or pulling vertical. It looks like I pull vertical right on takeoff, but that little delay is there so I know it's well over stall speed and the engine is running right.