Never adjust the wing for landing. Only for normal flight.

on final use the elev for speed control and the throttle for height. Once you "Load" the airplane up in the turn to final you want to fly the airplane a bit nose high. Once you have the airplane set a bit nose high you then use the elev to speed the airplane up or down, if you add throttle the airplane will go up. It takes practice and a low idle is good but you'll find you need to add a tiny bit of power to stretch the landing to center, it's much easier to stretch the approach to center than slow the airplane down once close to center. Once close to center and the ground you'll flair it a bit more and slow the airplane down to a near stall condition right where you want it.

A good thing to practice is to fly the airplane to a stall for spins. The exact same principle applies to spin entry as landing.

Tim