RE: will shortening my draw mean i need shorter arrows
Probably not but that depends on how well your arrow was setup for your bow in the first place. If you were borderline on spine and shortening your draw pushed you past the acceptable line then you definitely will need to make a change.
You did not mention if you were shooting carbons or aluminums. Carbons generally have fewer spine " classes" for any given range of draw weight....3 or 4 actually to cover almost everything from 30-80 lbs of draw weight and the typical arrow length range. Aluminums normally require more sizes to cover the same range.