I wish you luck!
There are so many variables and it is almost impossible to get good reproducible results.
Seems to me like you are in the right ball park.
I'd suggest the quickest/easiest area for experimentation is size of fletching.
I don't think you can get too light, a bare shaft provides plenty of weight.
There is much discussion about FOC/balance point, my personal view is you want the balance point about 1/8 - 1/4" towards the tip.
With a non-shoot-through bow, the tuning of the arrow pass for clean flight from the bow and getting that elusive clean loose off the fingers is vital.
IMO the front half of the arrow is only there to stop it falling off the shelf/hand/whatever, as the arrow doesn't need to flex round the bow in the early stages of the loose and there is little sideways force on it. So stiffest and fattest at the back.
A simple V spliced hardwood footing is a good way to increase tip weight and minimise breakages at the tip.
As has been said already, if you can see the arrow go, it's not a good shot.
Some info on my arrows shot from an Osage self bow, here :-
https://bowyersdiary.blogspot.com/2018/03/new-pb-for-distance.htmlDel
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