I'm shooting a little more weight, have a 29"+ draw length, and like relatively heavy points, so it should be no surprise that I need a little stiffer arrow than you listed. The thing is, what anybody else shoots is really irrelevant. In my opinion you need to find what works for you. Just keep working your way back with your bare shaft tuning, if you can get your bare shafts and fletched grouping together at 25-30 yards you know you have it right.
Don't cut your shafts until you have too, nothing wrong with long arrows and you can't put it back on after you cut it off. Have a selection of point weights on hand for tuning (both heavier and lighter than your preferred point weight if you have one). If you find you end up with a good tune but your points are too light, then cut your shafts back a little so you can go up in point weight. Shaft length and point weight are the key variables unless you need to go to a different spine. You can also play with the thickness of your side plate, especially if you find your .500s are too weak.
Start close and work your way back. It's also good to think about it as a process that may not be completed in one day. Tuning when you are tired can be a waste of time so think about it as a process that you work on over a few shooting sessions, each time refining what you did before. Once you get close, don't make any big changes based on one days shooting, a little form glitch might end up looking like a tune issue when it's really just an aberration.
Collect as many opinions as possible for a starting point and tune from there. This is a good process to follow if you don't have this link...
acsbows.com/bareshaftplaning