I answered ya on Excal but will here too.I think your problems are due to 25 yd sight in. I've had a bunch of V-zones [3 or 4] here at different times and now a L-zone and they have all been spot on at the longer ranges w/ 20 yd sight in.

Cossack: Read your post on Excal, if you are using the same 431 gr Gt's as Ranger, there's the reason you can't get 330 fps outta your Vortex. Those speed specs are for FFF strings and stock 357 gr arrows, a combination I've never cared for, but do like the FFF and 431's regardless of minor loss of fps.