I've shot Ektar in everything from 35mm to 8X10. Right now I'm printing 4x5 and 8X10 sheets onto CAII
20X24 and getting superb results. The problem with blue is easily corrected, but ideally should be done at the time of the shot. If significant, it's hard to correct afterwards. Rather than shooting at a lower ASA to get enough density to the layer, simply use the appropriate warming filter per a color temp meter reading or comparable experience. I carry and 81A and 81C. Then shoot at box speed (100) with the appropriate filter correction,of course. I have my C-41 dev by Lightwaves in SF.