Ok ………… I’ll assume that a tin-foil hat isn’t the solution.

Interesting; Since the heavier Bear doesn’t cause a problem we can probably rule out excessive weight.

So …………… One thing that I can think of is ‘possibly’ the grip is slightly different  on the self bow causing you to tense different muscles, tightening up the back of the neck, causing the head-ache.

Another thought is that a self bow might have a bit more hand shock causing the brain housing group to rattle.

One last thought; (and I’m way over my daily limit) I firmly believe that there is a ‘panache’ factor in the bows we shoot. This goes beyond the spec sheet with feet per second and all of that. Sometimes a bow just feels ‘right’ and sometimes it doesn’t.  The ones that don’t go back on the rack to be tried again later.  If they still don’t bond, they find a new owner.  I once sold a name brand bow to a guy in the club and the ungrateful clod actually tried to outshoot me with it.  He loved that bow that didn’t do much for me.

A wise man once said “Life’s too short to dance with a cranky bow”  (or something like that)

I was thinking along the lines of hand shock being the culprit.

One of the first glass laminate longbows I  made from a Bingham’s kit had such bad hand shock it would almost loosen fillings in your teeth.  I tried grinding down and replacing the tips thinking that lighter tip overlays would help but nothing I have done has helped.  You didn’t happen to sneak in and get that one out of my shed did you?

After shooting that one for a while I gave up.  It was just too painful.

What if ………………………..

You went to Wally World and picked up a roll of the shock absorbing wrap that they put on tennis rackets and wrapped your grip with it ???

And ………………… While you’re there grab a package of ‘choke rings’ that they use on bats. I put a set on my recurve right at the fade-outs and they seem to dampen the vibrations a bit.

You might also try a heavier string and heavier arrow and see what happens.

Do you have silencers/dampeners on the string?  I have a bow that shot good and put a set of beaver string silencers on it.  It was like shooting a different bow after that.  That might help some.

Not a problem, ……….. Glad to ‘try and’ help.  Just let us know if any of our suggestions worked.

One more thing ……………. Do you cant one bow more than the other ???  I have no idea what that might affect but it might be worth considering.  Variables  and all of that nonsense.