Now is the point in time to start measuring other things also. Start with your run time, so you can get consistent with fuel load and repeatable flight times. This is necessary for contest flying, but just plain handy for not running out of gas in the middle of an over head 8! Keep track of run time with a wrist watch or some one else with their watch. I time every flight I make, even just fun flights. Next is lap times. Just keep track of them for now as you find that sweet spot for the needle setting where the engine is performing like you think it should. If the engine run is awesome but lap times are too fast and you have trouble keeping up with the airplane, it's time for longer lines.Experience over time will help you pick a line length that is close to what you want. A prop change may yield some acceptable results, but don't do that at the expense of good line tension everywhere, or by slowing the engine down too much. If you are already in the ball park for trim, fly the airplane a lot after each change, even small ones, to be sure you like it or dislike it. Make one change at a time. If it doesn't work, put things back where they were and re-evaluate. Take a pad of paper and a pencil, and make notes. Some might say that this all would be taking things too seriously and an early stage, but I say that it helps breed confidence and success, and that makes things more pleasurable and fun!
Type at you later,
Dan McEntee