Can't get Caster into spec after Icon UCA install.

I personally max out the front eccentrics ("shorter" in my write up) and then start adjusting the rear until I get camber where I want it. This will normally result in max caster. Your passenger front ecentric is maxed out shorter, but so is the rear. If you back the rear out "longer" you will add positive caster (but also add negative camber). Your driver front has room to go shorter for sure and the rear can also be backed out longer to add more positive caster. Most techs just try to put it in the green and adjust for road crown. It's a bit of a balancing act between camber and caster and techs are primarily focused on camber as it affects tire wear more directly. I shoot for a tiny bit of negative camber and max caster (but I also live in the mountains and drive like an asshole).