Isx over fueling rear bank

[Redrocket]

Alright, 2006 cm870 has been deleted with a {name removed: engine-butchering-freaks-r-us.com } tune. Couple of months ago I was having a issue with over fueling and horrible raw unburnt fuel/smoke out of the stacks. We replaced the head, all injectors, all 4 actuators along with shut off valve, both fuel pumps. The actuators actually is what stopped the over fueling and smoking the first time around. Couple of weeks ago it started smoking again exactly the same and according to the test we are getting 14oz of return on the rear bank in the 10 second time frame and on the front bank it is correct at just under 9oz in the 10 second test. Wiring harness was replaced a year ago along with ecm but tested the harness just for shits and giggles and it tested out fine. I replaced the 2 actuators again on the rear bank thinking they might have failed but that didn’t solve it this time. We are stuck at this point. We are getting ready to pull the ifsm off and replace the diaphragms along with the 2 pressure relief valves as we speak. Is there anything else that could be causing this issue that anybody else has come across???