Unless I'm missing something even a GT UL500 cannot get down to 275grs finished.....the reason I'm asking is even at 55# 306fps at 29" 5grs/lb of draw sounds slow.

GT UL500 = 6.3grs / inch X 29 = 182.7grs
Tip = 80grs
Factory .246 nock = 10.4grs
Factory .246 insert = 14.6grs

Finished arrowbefore fletching = 287.7

Example three 2" Blazer vanes weighs 15grs itself, so even with feathers your finished arrow would be mid 290's and with even small vanes like Blazers around 302ish grains.

What did you fletch them with and did you actually weigh them or were you TOLD they weigh 275grs?