On your approach, keep the nose down slightly to maintain airspeed and keep the wing flying. On a calm day or in very light winds you should be able to do this at idle. On windy days you may need to carry a little throttle depending on the plane. Rotate the plane to level a few feet off the ground and GENTLY feed in up elevator as needed to keep it level until it touches down. To avoid it bouncing back up, release the elevator just before the wheels touch. It will roll out on the mains for a ways then drop the tail. Then hold up elevator to keep the tail planted and taxi back to you.

Idle speed should be a nice smooth RPM with no indication of the engine quitting. It shouldn't be so high though that the plane starts rolling away at idle. I fly off of pavement and I like my planes to sit still at idle or roll forward slowly. The type of prop has a lot to do with this too. Some make a lot of thrust at low speed and keeping the plane still may be impossible. Your 11x5 should be perfect for the engine and plane though. You should have a nice, reliable idle.

Should you have servos checked out? I say no, at least for most sport servos. It is easy to determine if you physically damaged or stripped a servo though. The only thing you can't detect it damage to the electronics. If there is really any doubt about a servo, just buy a new one. Paying postage and labor to have it checked will cost much more than most new standard sport servos. Receivers are a different story... checking them out (or replacing them) is mandatory.