Yes the 3000is is 12A the 3000IH is 8.3 amps.
You will note that the difference between a 50% discharge and a 100% discharge is 700 cycles. Most people would rather not buy 2.2 batteries instead of 1 to get 1200 cycles.
NOT accusing you of anything but good intentions and being wrong on something that could cost a lot of folks here a lot of money! I've been wrong a time or two myself if my wife is to be believed!
Oh and for the group...please note that you will NOT get the same number of cycles from most other deep cycle batteries...these are TROJAN golf carts being measured... WHAT will hold true is the RELATIVE cycle life based on depth of discharge. These are also STATIC tests and life is SHORTER for batteries bumping down the road.