There are many injector cleaning services for about $30 each plus shipping. If you have several you can get them cleaned. If it were me, buy an injector pulse tester and back flush them with carb cleaner. There are videos on YouTube to build this easily. RZR_Joe and I both know you have contamination. A .05mm filter will catch whatever is causing your issue. I have experienced this back when I put a bigger AEM pump in for 1300cc injectors. Flushed tank twice and found that the 3" long fuel hose that came with the new pump could not resist E85 even though AEM said the pump was compatible. My hose softened and eventually ruptured in the tank and that was how I found the breakdown of the hose which was passed to the injector. Replaced with correct hose and cleaned my own injectors. No more issue.