i'm shooting around 294 w/ gold tip 75/95's, .003, and have shot them in groups with 4 inch offset vanes with no trouble. and i really can't say enough how much easier it is to see the blazers in flight, and what they are doing. i shoot with both eyes open, which helps anyway when seeing your arrow, but the blazers make a big difference for me. its a constant reminder when i see a wobbler to not punch, grab, torque, etc. i'm not sure why i can't see the 4" vanes as well (same color), but it really is a big difference, and hopefully will help me in the field this year.