Thanks for following this up - I've managed to fix the issue. I did some browsing of these forums and came across this thread:
Long story short, changing auF12105: "Engine peak torque for SCP". from 138 (F6X value) to 120 (stock TT value), it seems to have cleared the error right away. Didn't have to reprogram or anything in forscan. I left the VID block values from my original read in the merged file.