E85 Injector Issues... Anyone?

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Have any of you guys run seafoam though the car(or other fuel injector cleaner) on a semi regular basis? Wondering if the people not getting the build up may be using something that cleans it up, and those that are getting it don't use a cleaner.

I havn't been running said injectors, but i had some 550cc RC injectors running E-85 all last year. Mine were spotless but i switched them out to run gas this summer on 450cc injectors due to idle issues. Will be going back soon i think, but now worried about this black goo.