3+2 Offset Casting

Hi guys,
I'm machining 4 elbow shaped castings on our HAAS trunnion. It has it's own cradle if we can call it that, and I'm getting inconsistencies on our castings. Basically I have to machine and O.D. concentric to an I.D., that doesn't get machined, and it's not lining up.
I don't want to have to move everything in Cimatron because each part is different. I've been messing around with G154 P1,P2...etc. It seems to work ok but I can't line it up with a boss feature when it rotates to A90. What do you guys do in these situations?