Help | 250 or 300 arrows?

[Sirgallagher]

Trying to determine if I should get a 250 (8.8gpi) or 300(8.9gpi) spine in the Victory RIP TKO Gamer arrows. Victory spine calculator says i should do a 300 but if i change some of the front or backend weight +/- 15ish grains it says do a 250. So, feel I am on the cusp. From what i read, if your on the cusp go stiffer (250). Any thoughts or recommendations (aside from buying and testing them $$$).

**Bow Details**
Bow: Bow Tech Carbon Zion
Draw Length: 30"
Draw Weight: 72lbs
IBO: 335fps

**Arrow Details**
Arrow: RIP TKO Gamer 250(8.9gpi) / 300(8.8gpi)
Arrow Diameter: .204
Arrow Length: 30.5"
Fletching's: 18gr
Nock: Nocturnal (27gr)
Shock collar/insert: (50gr)
Broadhead: (125gr)
Total arrow weight: 490ish gr

Estimated FOC: 12%
Estimated FPS: 287fps

Thanks!
SG