All guns are an entity unto themselves. There is no such thing as a choke and shell combo that is "GUARANTEED" to shoot well out of any gun. I have always had to try numerous combinations to find what an individual gun liked best.
That said Indian Creek Chokes are as good as any out there. I never had any trouble finding a turkey shell that patterned well out of them. You tried 1 type shell through it from your gun and ran to the internet to proclaim that all Indian Creek chokes suck. Seriously?
You could at least try hevi-13 number 6's or 7's through it before you get all suicidal.