Tinker...I remember you needing those at Mo Jam.Good that you bring this up.Many ways to skin a cat here.I've skinned quite a few dozen of these.With 14 to start with be happy to get 12 good ones.If your using glue on 125 grain field points or broadheads cut your shafts to 35.25" long for your 34" draw after you get them spined to what you want.The 3/8" deep self nock[don't worry about grain as these are little trees your shooting and growth rings,not straight line grain as in split timber shafts but still wrap them below the nock a good 3/8"] and the 3/4" long taper for the field point will leave you 34" to the back of the field point to throat of the nock then.The tools I use are a spiner/grain scale/2" by 4" ,6" block of wood with 36 grit sandpaper/and a chunk of moose antler with holes drilled in it 5/16",11/32",23/64",and 3/8" as a sizer.Make sure your shafts are straight before spining them.Heat straighten them if you got to before taking all bows if any out of them.I use a lamp with a mantle round with with a tall glass chimney.Hot enough up there to light a cig if needed.After that spine them.Remove material with block and sand paper on flat work bench.Keep spining them between material removal.Try to keep your full length taper while doing this.When within 5#'s of spine weight go to finer sand paper to fine tune it to your spine.I lots of times use a 1/4" drill then.You can check diameter with your sizer.
At your 34" draw length on a 50# bow using FF string[you'll need 5# stiffer spine using FF than using B-50] your spine should be somewheres' around 75 to 80 pounds but I dare bet 70#'s will shoot fine off the 50# bow at the shaft length you got there.As said every 1" over 28" add 5#'s spine.Full length taper is very forgivable on these shafts.So as you can see there won't be much material removal for you to take off.I would imagine you can get away with 11/32" nocks out to at least 23/64" tips or more.You can shape just the tip area for your glue on 23/64" field tip or broadhead.I've never made them that long before but my guess would be you would have shafts into the 700 grain area.I know your a crafty guy.Let me know what you come up with.I shoot 600 to 650 grain arrows of 45# bows myself all the time.
PS....Take your time.It'll be worth it in the long run.Most times after you make 1 the rest will come close to what that 1 was,as they were all harvested in the same area.Good luck.