I just got a new bow and I'm having trouble getting rid of porpoising.  I have to raise the nocking point to 1" or more to get rid of it.  I shoot 3 under.  Is this considered "normal" or is it more likely a form issue?

hello, i too shoot 3 under and on all my bows [recurve, longbow and selfbows] my nock point is at least 1/2" and up to 11/16" also check your nock to string fit. and yes form can be a problem also, no easy one size fits all fix, must do a lot of erperimenting but one thing at a time, hope this helps a little, rich pyle

Unless you can adjust the tiller, you will have to set the nock pretty high.  On my bow, split fingers require a 1/8" positive tiller while three under uses an "0" tiller.
The tail reaction you experience is pretty common.  I see it just going to different diameter arrows; 5/16" G/T carbons to 11/32" woods

I find that by reducing the pressure on my ring finger, and carrying most of the weight on my index and middle fingers, my nock point can be lowered.  For example, when I would carry more or less equal weight on each finger, my nock point might be 7/8" (which would vary from bow to bow).  Shifting the weight to the upper two fingers might move my nock point to 5/8". I think it also helps if you can eliminate all tension possible from your string hand, which is just basic good form.

I determine my nock point by shooting bare shafts and adjusting the nock point until the bare shaft is flying slightly nock high, which I prefer to level flight as I believe slightly nock high is more forgiving.

McDave, I think you may have hit on it.  That's the one issue I seem to struggle with most, hand and wrist tension.  Thanks for the reminder.

I am with McDave,
also tie a second nock point below nock to keep arrow from sliding down string, very helpful with three under.

X2 on the second nock point. Especialloy since I switched to 3 under it really seems to help.

I added the second nock point and all is well.  Thanks for the advice guys.  The funny thing is, I always use tie on nock points above and below.  I just didn't start out that way this time.  I was using a metal nock point to get me where I wanted.  Next time, I'm going straight to the tie on type.  Lesson learned.