ok,, 50 55 cut to 29 or 30,,, if it was me I would cut them to 30 and then trim them if needed,,( dont worry about the arrow being to long just worry about the flight)
if the bow is really set up right,, ( not too much handle to shoot around)
then the noise is your release or brace height,,
should be about 5 1/2 or 6 inches,,
50 55 should shoot great at that length,, and you can cut them shorter to shoot stiffer,, but I dont think you will need to,,
keep in mind that if you are holding long,, you will strart to stiffen up and and its hard to get a smooth release,,
I am not saying snap shoot,, but draw the bow with a loose grip,, and when you have it hitting anchor,, let it go,,
if it shoots quite,, then you can gradually work up to holding the bow longer if you want,, and get a good release,,
for me,, drawing hitting anchor for a split second and releasing gives me the smoothest release,,
yes I know some advise lighter spine arrows but for me,, what I suggested will work,, and even heavier spine arrows will shoot great if your release and hold is good,,
do not torque the string, (twisting the string one way and the bow the other,, they have to line up)
usually what happens to me as I get used to how the bow shoots,, the release gets better and better on its own,, just takes alot of practice,,, being relaxed with your bow hand and release is hard to do,,,,,
and yes when I do my part the bow is wisper quite,,