I agree that I should be overspined, but why is it that my arrows are tail kicking to the left in flight?

I shoot 51 lbs at 28", and yes GT 5575 are to weak in spine with any weight up front.   29.5" GT 7595 with a total of 225 grains up front works great.  Shoot what works for you, not what someone says you should shoot.  I have shot stiffer spines than most others recommend since about 1972.  It works for me.

The simple test is to put less weight on the front and see if it gets better or worse.  Make the required changes based on that.

I was prepared to order gt35/55s from sipsey last year, but he convinced me to try the 55/70s for my jodie cole #50 longbow. The 55/70s are cut to 30 1/4" and I'm shooting 200gr (point+insert). They shoot great. I was afraid they would be too stiff, but no problems at all.
Steelhead

I am shooting a 52 lb bow and useing 55/75 gt arrows and am shooting better then I ever with these arrows!! I just got back from the range and am very happy with them. I useing a 145 gr tip works great. Just trying to help?  

I shoot 5575's out of my 50# @ 29 inch Widows.  Arrows are cut 30" BOP with a std aluminum insert up front and 125 gr. field tip.

I've never understood why some folks need a 1/2 pound of weight up front to make a carbon fly.  But it does show that everyone is different.

Personally I think you just have too much weight hanging out front.  I do not beleive you could get a 3555 to work with your setup.  I would gradually reduce the amount of weight you have up front and see if you don't see improvements in flight.

One thing I learned long ago is there are no absolutes when it comes to what will fly and what won't.

Thanks for all the info