Fine tuning, knock height,etc

[JApple]

Have my elk arrows made mounted with 160 Grizzlies.  Both the broadheads and fields are flying straight however the broadheads consistently hit about 4-5" low....  Brace  height appears good and knock point is right around 5/8".  I shoot split finger (two under).  To get this knock point right should I go right to paper tuning (which I didn't have the best of luck with before, always showing knock high) or lower my knock point even more and watch how they fly... I've heard mixed input on split finger shooters, some say that you need a much lower knock point than three under but it seems most people say you'll probably be around 5/8 to 3/4.  Thanks for any input!  
J

[SAVIOUR68]

Apple lower your nock point to 1/2in and recheck your broadhead and field tip arrows for groups, there in no exact given nock height which varies from shooter to shooter. Split I can shoot 3/8in on some bows just fine. Are you using 2 nock points on the string one above and one below arrow nock ?

[Easykeeper]

I do all my tuning with bare shafts but if every thing is good except your broadheads are grouping a little lower than your field points definitely try lowering your nock point a little at a time until it gets better.  I agree with Saviour, there is no magic number on the measurement, you need to find what works for you.  I also shoot split and usually end up around 1/2" plus or minus 1/8"...but that might not work for you.

[JApple]

Thanks guys for input, that's helpful... I think my concern was that if I was at 1/2 " or so I might be getting a false high read... I only shoot one nick, have never tried two. Thanks guys

[SAVIOUR68]

Apple put a nock below your arrow nock to make sure that upon release the arrow is not sliding down the string bouncing of the shelf causing a false impact low w/broadheads

[Daddy Bear]

If both are flying and grouping well with the only difference being the elevation as you describe...conventional rule of thumb is you lower the nocking point, which will bring your BH group up into your FP group.  Tie on an adjustable nocking point that you can rotate down and adjust in small increments until you find the sweet spot.  Once you find the correct spot, super glue it into place.