OK..you are shooting an HHA longbow and it is probably pulling 53# - 54# at 28".
Your arrows are 29.75 BOP. What is your actual draw length?
No offense intended but it is difficult to see your actual draw with an appropriate "heel down" grip being 29.75 inches.
Background: When I shot recurves (since the late 60s) and in recent years shooting "high wrist" longbows, my BOP was around 31".
When I switched to the Hill Style just over one ago...here on this thread...I began shooting a straight gripped HHA Half Breed longbow. I was told my draw length would drop significantly by Nate Steen. I thought he was nuts! He was dead nuts on and I now consistently draw a tad under 27". That is 4" difference and that will make a world of difference in what arrow you can shoot.
He and I are big guys with long arms and huge hands.
My suggestion to you is to begin at the beginning....
Take an arrow and mark it at 1/2" increments. While actually shooting, have a bystander witness your actual BOP but before you do this, understand that the "form" for shooting will morph over time as you learn the heel down grip in harmony with a consistent bow arm bent slightly at the elbow (not to emulate Howard...it happens naturally)
Don't order arrows until you can nail down the actual spine and length needed based on your known repeatable draw length and the actual measured weight you are pulling at that draw.
I shoot Surewoods 90% of the time and XX75s occasionally. Any arrow will fit the bill if it is compatible with your draw, your bow (centershot), and weight you are pulling at your draw.
hope this helps...I learned it all here in this great thread...
Good luck Brazos!