Pat that is probably why I can push 175-230 grain broadhead combos from my 64-67# bows with 70-75# spine.  Occasionally, I bump up to 80# spine.  But most of my shafts are tapered and footed.

Thank you all, I'll still show up sometimes!

Excellent buck.

Pretty arrows.  I have only been fiddling with basic stuff on my woodies.  Dipping or splatter staining.

Thank you all and all other customers!!  I'll be around...

Got er did 
 

1816's cut to 29" with 125 grain tip/broadhead would ordinarily be a little weak for a 35# bow drawn to 28".  However, longbows not cut past center like shafts a little on the weak side, so it might work out okay.  Try it before you buy too many 1816's though. You might need 1916's.  Use 4" feathers

My choice is 600 carbon 5mm.  Around a half-spine stiffer, and would get you into a bigger selection of inserts.  The 1816's would be fine as long as you have a really good bareshaft with 150 grains.  Either way you'll probably be over 450 grains with Aluminum (good 35# weight), and if not center-shot might be right on? Good luck!

Im new to cresting. I typically like to shoot aluminum and wood. For aluminum I have been dipping one coat of polycrylic and then spray painting crown, cresting and few more dips of poly. I wasn't super happy with how the paint bonded. Any suggestions? I have considered the bohning primer but that is pretty spendy.

Here's my first set I ever crested and spliced.

TG, not far behind buddy!
Mr. Arctic, I'm thinking unless you have engineers' software, and experience in rocket science, best not to loose sleep and just start experimenting...I should take my own advice.
I have some No Mercy single bevels, that seemed to wander a bit when matched with my 5mm shafts and 4" Trad-Vanes.  Fly perfect on 6.5mm shafts with 5" feathers...need to put this hobby down for a bit (I tell myself), and wait to try the 5mm with feathers to see if there's a middle ground.
Jeff Phillips from YouTube says 6.5mm are more forgiving and better suited to big heads; I'll roll with that for now.