The way I've been taught to check for minor draw length problems
If your draw length is a little too short, the movements in your site picture will be more short and jerky. You will be able to hold on your target, but it's easier to throw one out.
If you draw length is a little too long, the movements will be longer and slower but with a littlegreater range of motion.
Perfect draw length the movement of your site picture is slow and small.

This is for draw lengths that are within 1/4" of perfect.
In all cases, I think that the closer you can get to perfect, the better. Terry Ragsdale, one of the best professional shooters of recent times, says that he spends more time adjusting the draw length on a new bow than all other tuning combined.

Hope this helps,
Allen