Regroup and rethink!

If you are new to handling and tuning a bow, I personally do not believe you should shoot a short ATA bow.

Until you learn more about what provides good arrow flight and what causes bad arrow flight, I do not believe you should use carbon. I do not like the performance I have seen out of carbons, even carbons that I consider expensive. Experienced shooters will know how to spot flight problems related to the shaft. You would probably blame yourself and keep trying to be accurate with bad shafts.

A range finder is beneficial to establish distances to static landmarks around your stand, but will not provide any benefits for estimating the distance to a deer as you are about to take a shot at it. Think about that. If you are having problems visually estimating distance, use a quality pendulum sight until you improve in visual estimation.

A good mechanical release is a good move. Anytime you can keep your fingers off the string, you are ahead of the game. As a recurve shooter (also), I know how critical it is to get a clean release when using fingers. If you are a good finger shooter, go with a longer ATA and stay with the fingers. That would allow you one less change.