I agree with Misha. I started developing Ektachrome back in the '60's, the blue can be minimized by altering the developing times. But as it sounds like you're using a commercial developer, you'll never get rid of it to your satisfaction. Ektachrome was developed for the do-it-yourselfer, Kinda like a Tri-X in color. While Kodachrome, which has quite a few extra steps in the development process, has always been a more commercial film. You didn't mention it, but did you use a ring flash on the macro images? It helps a lot!