I shoot 56# to 63#,as for trajectory, there really is no such thing as "flat". All arrows have have a trajectory path,no matter what bow they are shot from. Some are not as extreme as others, especially at short yardage. I have buddy's that shoot wheels and when we shoot together, their arrows drop off rather quickly too. They don't notice it as much because they are looking through a peep sight at pins that have been calibrated for that distance, but if you stand behind them and watch the arrow you will see the drop ( obviously more at longer distances). The challenge of Trad is to be able to calibrate your mind to the tracjectory of your setup regardless of the drop, and do it consistantly.
Rod