Draw length and arrow length

My draw length is 28” shooting 45lb, right now my arrows are at 31” is there a specific length I should start at with my arrows. Right now I’m 3” over my draw length and I’m think I should be at 1.5” and not 3”. Any suggestions??
Does not matter at all. Use arrow length to tune the arrow for best flight.

I have some set ups that are full length 32" arrows and some that are only a ¹/⁴ inch infront of the riser. Its just how the arrow tuned for the given set up.
 
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