Since no one has replied yet, I will try to help, although I am not 100% certain that I have this correct.[]

AMO draw length is the distance from the string (nock groove would be the same thing) to the lowest point of the grip, plus 1 3/4". In other words, if you measure 28" from the string to the low point of the grip (at full draw), then the AMO draw length would be 29 3/4". That is how it is measured by most manufacturers AFAIK, although some manufacturers are off by a good bit on their measurements, usually too long.

Some people talk about true draw length, which would be the just the distance from the string to the low point of the grip. A true draw length of 28" would be the same as an AMO draw length of 29 3/4".

The release should not really change how the draw length is measured. It may change the draw length that feels most comfortable to the shooter though.