u/Fluid_Tap_250

New to archery hunting and have some questions about arrow stiffness. This is not set in stone, but I am a 29" draw @ 75# draw weight. I am trying to build an arrow around 425-450 grains. I would like to use RIP TKO Elites with a 125 gr broadhead and 30-50gr insert to achieve this. Not sure if it matters, but I have a V3X 33".

Question: at this arrow weight and my bow specs, does a 250 or 300 spine make more sense? All the charts I look at differ or I am right on the border.

Edit: Average Reddit/internet moment when there are a bunch of comments but nobody can answer the single question I asked.