For your described set-up I would try 80-85 lb. spine range. I second Jim's suggestion of MinWax wipe-on Poly, it is easy to use and if you experience "target burn" on the front of your shafts you can wipe on more sealer, it blends in easily. Initially, lightly sand your raw shafts with 220 grit wet-dry sandpaper, wipe clean and wipe on a coat of Poly, let dry 12-24 hours and wipe on a fresh coat. Repeat for 4-5 coats. Lots of good shaft suppliers but you will find none better than Surewood Douglas Fir.