Bldtrailer,
Without seeing you shoot it's a bit hard to determine just exactly what is going on. Assuming your form is good then you need to decide if you want to stay with the 300 gr points or go down in weight. The 250 gr points seem to right. However, with the 300 gr points the easiest thing to do in my mind is to start gradually trimming your arrow shaft down 1/4 inch at time. Paper tuning is fine.....if you have very good form. If not....you may get a little frustrated because things like the nock high indication could be cause by you rather than the exact tuning.
Again...assuming you can shoot....bare shaft tune and incrementally work your way away from the target. I promise you....if you can shoot bare shafts in line with your POA out to 40 plus yards.....your arrows are tuned. If you have good form.....a well tuned bare shaft will shoot just like a fletched shaft. By that I mean no porpoising or fishtailing.
I bare shaft tune all the way out to 50 yards. Once I'm pleased with that then I fletch them up and go to BH's to final tune. You can't go wrong doing it that way.
One other thing....on the nock high business....try orienting the fletch different ways. I shoot with my fletch at 12 o'clock, 4 o'clock and 8 o'clock. Also try a different size fletch. A well tuned arrow doesn't require much steerage even with BH's. My hunting arrows have 318 grs up front (200 grain Grizzly El Grande and steel BH adapter) and either 3 X 2 1/2" or 3" feathers on the back end.
Hope this helps,
Brett