I have been flying for quite a while and have been an instructor. It is MUCH easier to fly an overpowered model than an underpowered one. You can always throttle back.

Regarding the U turns on take off you are experiencing I suspect that you may be taking off too soon before flying speed is reached and climbing steeply. This is a common fault with beginners. One half of the wing is stalling giving you the 180 turn. The design characteristics of the trainer means it does this rather than a full blown flick roll.

So keep your 46 and get a little more ground speed before take off and climb out gently.

BTW Here is a full blown flick roll on take off. NOT PRETTY. NB second flight