A couple comments...
"Textbook" draw length is to have the bow arm straight, parallel to the ground, string just at the tip of your nose. If you go from a long axle to axle bow, to a short one with a steeper string angle, you need a longer draw length to keep the string at the tip of your nose as opposed to in front of it in space (all else equal).
But, that makes you anchor further back, so you need to shorten up your D-loop (if you can) to get your anchor back further forward, or you need to get comfortable with a different anchor.
Peep size will need to go up with a shorter axle to axle bow because the peep is further from your eye with the steeper string angle (This is for a short vs. long axle bow with string still at the tip of your nose)
Regarding long axle to axle bows: Generally they are more forgiving, have a better string angle and more latitude where you anchor. Shorter A2A bows are generally a little faster.