Another tuning question

[Jhawk]

I am shooting a BW CHX 51lbs @ 28".  I am pulling around 26.5".  I just put on a new string from SBD and I am now trying to tune some new arrows.  I used Adcock's method and the felt good with some Heritage 250's with 200 grains up front.  I was knock high but I have never been able to get my arrow perfectly flat.  After fletching up my arrows I was seeing strange flight and wasn't sure if it was just the lighting and it did change with the sun at different spots.

I went to a range Saturday and shot through some paper and was knock high but felt like my spine was right.  There was one other trad guy there and I asked if he would watch my arrows fly at longer range and he agreed that there was considerable proposing up and down.  He had never shot a bare shaft and tunes his arrows fletched.  We played around with weights and ended up dropping down from 250 to 135 grains up front.  This produced a very flat arrow and I liked the way it shot.

I got home tonight and only had a few minutes but I shot a few more arrows.  I had some unfletched 250's cut and shot them with 135 grains and they were showing heavy and knock high.  With my original set up I was back to proper spine and knock high.  Shooting the fletched arrows with 135 grain heads flight looked good and 250 I got the porpoising again.  

I forgot to mention I have played with brace height and have it set at 9".  Played with knock point and its set at about 1/2".  I lowered all the way to zero and it was knock left and high.  Above 1/2" I was getting even more drastic knock high.  I also have some 150's but they are almost too short cut at 26.75".  I will try and shoot those with the lighter head and see what they do.  

Questions:  Does any of this make sense?  Should I just shoot the 135 grain heads because they looked the best even though I am pretty sure they are over spined?  What else could I do?

[Sam McMichael]

I would shoot what performs best. However, that is no reason to stop experimenting to see if you can improve further.

[JOEBO]

The arrows are way to stiff. Try some 150's at full lenght and cut a little at a time until you get the spine correct. I had the same problem.
Being so stiff they are hitting the shelf and will always show nock high

[Jhawk]

Why would my knock be high if I'm over spined?  Prior to this new string I was shooting 150's with 200 grains up front, cut as short as possible.