KK-
Welcome back!
The GT charts usually come out on the weak side. It can be very frustrating if you do not know this upfront.
I would recommend ordering the 7595 spine when you upgrade. The weight difference is very minimal (8.9 vs 8.9 grains per inch, I believe) and its better to be a little on the stiff side...
Like you, I shot the 5575s for several years with good accuracy. However, broadhead tuning became much easier when I changed to the 7595s.