Chasing a vibration

Here’s the backstory. I have a 2010 V fairly modded. LS7 heads, comp cam, upper and lower pulleys( 18psi), injectors, 108tb SW long tube with SW catted x pipe. I’ve been driving the car with the same tune for more than a year. I don’t think this is a software issue. I had a rocker come apart so the car was down for a bit. I replaced the rockers with TSP with brass bushings. Had a vibration when cruising at about 50 and it only happens under mild acceleration. First thought was driveshaft. Found the carrier bearing a little weak, replaced it. Still there. As the vibration started after the rockers were installed I went back to a factory set with trunion upgrade. Vibration still there. It’s not the torque converter as the vibration happens before locking and the vibration transfer after lockup, but the off chance it was, I replaced that also. Looking at fuel trims bank 2 is slow but both banks mirror each other when the vibration happens. I’m going to swap out injectors today and pull the valve covers to check springs and pushrods today. But at this point I’m looking for ideas. The engine is causing the vibration. Just not sure what system (fuel, air, valve train, block internals) any input would be helpful. I’ll post an update today after I change injectors and do my inspection.