Hmmm.....not easy to design. Since you can't get ideal positioning on the mounts, at least consider making the arms close to the same length so you don't get so much change in the numbers as the suspension cycles. You can test the amount of change you get by changing your height numbers a couple of inches at a time to simulate suspension travel.
Since Moab type stuff is where you'll wheel, a lower A/S number would be desireable, since it will cause less bouncing.......more A/S, more bouncing, less A/S, less bouncing. I understand that a good rule of thumb is to use the top of the front tires as a guide for the instant center, and then don't worry about the A/S numbers. For less bouncing/more throttle move the I/C forward, for more crawl grip/less throttle move the I/C back. Basically, this means more or less anti-squat, more A/S for light throttle crawling and less A/S for higher throttle with minimal bouncing.
Since you're not going to do much rock garden type stuff, then ground clearance isn't so important. Playing with the calculator, pick some good locations for your frame mounts, then play around with the axle mounts to improve the numbers. I think seperation between the upper/lower links is important at the axle, but I don't think seperation is important at the frame. Also, try locating the upper so it's close to level, then play with lower arm locations.
Have fun,
