Hello guys, I kind of know the basics of the props, my situation is the following,

I have an extra 330L from nitroplanes with a 46AX and pitts muffler, my plane is heavier than average, not that much, but still, anyway.. I am currently using a 11x7 prop and it took me a lot to take off, when I started to climb, I had to pull elevator very gently while the plane gained speed, once it was on the air, the plane was a rocket, flying very fast even at 60% throttle, however, when decreasing below 50% throttle, the plane does not seem to have enough power and it looses altitude during turns.......

I also noticed that when landing, if coming too slow the plane just seems unpowered and one of the wings stalls......

I was thinking that if I changed to 11x5 (or 11x4), this would give less top speed to my plane but maybe would make nicer the low speed landing approaches??? However, I am not sure and that is why I would like to ask to the experts of this hobby, given my case what prop is recommended???? My plane (extra300!) can not float, reducing speed makes it stall and then due to the prop (I guess), my plane does not speed up fast enough to recover, I have been lucky to land it without problems but I do not like that feeling of the plane tending to stall while approaching to land if I reduce speed too much......

Opinions please....