sight advice ?

[wildwood]

I checked out that walk back tuning that looks like the way to go I'll go get it paper tuned then try that out I did think it was  my form at first but im pretty constant at my other yardages. 

[snarkybull]

Try using your 50 yard pin at 60 yards.  just aim high.  if they group back towards the middle you might have a bent or broken 60 pin.  another possibility could be your bubble is a little canted or loose and doesn't like the steeper angle.