i have the hv 1 350’s at 29 they weigh in at 334 grains im shooting a dxt with a 28 in. draw @66lbs the chrono showed 294 not sure on the ke but its probably more than enough and they fly perfect just my two cents.
IMHO the HV’s are just too light.First off you are going to want to keep near the 5 grain per lb rule and it will be a chore doing so.I too shot/shoot 340 spine arrows and went with the 350 Vforce V1 arrow.Bar none the best arrow I’ve shot to date.Beleive me when I say I literally have tried enough brands and spine legnth combos to last a lifetime or two.
Then, I’d recommend going with the VForce 400 at 28″ length.
This screenshot is with the hunting filter ON, so there is a slight bias towards a stiffer spine. As can be seen, the 400 would still be slightly stiff, which isn’t a bad thing for broadheads, especially fixed-blade since they tend to tune easier. You can try the 125 grain tips also on this shaft and it may give you better groups, and a quieter bow
I agree that the VForce HV series are very light for hunting, better suited for shooting 3D foam than critters, and the 350 spine would be way too stiff for the setup.
PS – When using OT2!, it automatically inserts the nock adapter weight for the Victory shafts, so if you aren’t using the nock adapter, be sure to zero it out.