Check Easton's arrow selection charts to see how they compare. GT 5575 is a 400 spine--at least Easton marks theirs right. And FYI I do shoot Gold Tip arrows at times.
I think you'll find that in most cases your arrows are right on the upper end of weight range at 65# at 29". There is no doubt in my mind that should you go to 70# you'll need 7595, as they are a 340 spine. If you want what I consider to be a better choice in Gold Tips I would choose the Ultralite 22 series, a 300 spine.
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Martin/Rytera Staff Shooter
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