Im wondering if the easton hp inserts are any better than regular inserts for aligning broadheads.They seem longer than the gold tip inserts so im wondering if they would have more contact with the inside of the arrow which may help align the broadhead with the shaft resulting in better arrow flight. Also, which ones will fit Gold Tips? Is the easton 400/500 or the 340/300 the same size as gold tips?

They won't fit the Gold Tip shafts. They are made for the epicshafts and aretoo skinny.

Just use an ASD on the shaft and the insert.