Shooting a Leon Stewart Slammer 52@28, drawing 28". Presently shooting gold tip (black shafts) 3555, cut 29.19", 145 grain field points, 50 grain brass inserts, 5" feathers and wraps. According to Stu spine calculator arrows spine at 53.4 and they fly like darts.
Wanted a heavier GPI, so I bought gold tip (black shaft) 5575, 50 grain inserts, 5" feathers, wraps. Presently cut to 30.5" and using 200 grain field points. Fletched flying stiff, hitting left (right handed). According to the spine calculator arrows spine at 49.0.
My question in theory if I cut the 5575 to spine in at 53.4, shouldn't they fly like the 3355 spine at 53.4? Could the 5575 be so weak the shaft giving a false stiff reading?
Wanted opinions prior to cutting the shaft shorter.