Hi Bryan,
No worry about changing the Serial1 to 23 for RCin. Your best reference for your quad would be Andy’s 7" LR build series which includes a parameter file. Mine is essentially a copy of that. The difference will be your 4S power vs 6S for that one and mine. It’s possible Auto Tune will raise ATC_ACCEL_P/R max values from the initial values close to where you were, that’s probably OK. The Angle Pitch/Roll P term though is higher than I have ever seen it. I wonder if it’s because of the V-frame config.