I currently own 2 big Jim thunder child lbs. One is 58 inches and 54#'s at 29, the other is new and is a 56 inch 50#'s at 29. Now here is where I am struggling, with my 58 inch bow I get perfect arrow flight with the 50#'er I consistently get a nock high arrow flight. I have tried everything from brace height to nock point to sanding the nocks and regardless of the changes continue to experience nock high arrow flight. I have turned my nocks thinking feather bounce but nope still there. Any insight as to what's happening here? I am shooting ad trad lites with 225 grain tips out of both bows. I can't understand why my 58 inch is throwing laser beams but my 56 inch bow is giving me fits....

Welcome!  Where are you in MD?

Split or 3 under?

me thinks it could be your release , different string angle

I have a 56" Browning Wasp I am currently trying to master and if I don't perform a near perfect release I get nock high flight.  I'm drawing just over 30" and the finger pinch is fierce.

Shooting split finger. Could it be caused by too much pressure on the bottom two fingers of the release hand? It's strange how just two inches could cause this issue.                                  Mike I am just a stone throw away in the beautiful metropolis known as Boonsboro....

Probably the opposite.  Persistent nock high can be caused by excessive downward pressure of your index finger on the nock, which causes the arrow to deflect down and then bounce up, which causes a false nock high.  It's hard to avoid with a short bow and a long draw length.  However, the way to avoid it is to relax your forearm and hand and draw with your back muscles, such that the force of the draw is straight back and not slightly up or down.  If you have a high drawing elbow it can cause this problem, but the solution is not to lower your elbow, but instead to draw with your back muscles and relax your arm so that your elbow comes into alignment automatically.

Mcdave thanks for the insight I will try that tomorrow and see if I can make any headway.

It's more than just two inches of bow length, there is 4 lbs of bow weight plus the fact that even though you are drawing both 29"s, you are getting deeper in the force draw curve on the 56" bow. Not a huge thing but combined with the added draw weight can create the need for a slightly stiffer set up.
likely your arrows are bouncing off of the riser causing the nock high.

I know that the AD's are touted to be capable of shooting on multiple weight bows, but there are exceptions.
good luck, BIgJIm

Big Jim should I try a stiffer arrow or weaker arrow?  Little confused in that. Regardless..... Your bows are THE BEST!!  And I will be calling ya soon for a third  

I had same issue McDave desribed above. When switching over to trad, and using short bow with 29.5" draw. My split fingers needed 1/2-5/8 high nock point cause I was bouncing arrows off the shelf. In my case anyway, it made a HUGE difference with a 1/16 change to nock point as to how the arrows flew and I needed to pay closer attention to my release. Now on my ML10 Hill styled gripped bow, I have to try to grip it the same every time or the tillers get out of whack and send the rear of arrow accordingly.

Sounds to me like you might need a weaker arrow. I would venture a guess of 1/2" - 5/8" nock height.

Are you getting undue wear on the shelf?

If you send me a pm, it will let me know that you have replied and I'll get back with you.

thanks, bigjim

I think Jim hit the nail on the head. Weaker arrow is needed. 225 gns up front now you need more or drop an arrow size.  Also nock an arrow hold the bow sideways to see how the arrow looks on the shelf. You can see for yourself if it's [the string nock] to high or too low. Arrow nocks are tight on the string? If too loose they will cause nock high and noise. Just for the hec of it shoot one arrow 3 under. Let me know how you make out.