Those two issues would drive me crazy.

If you swapped the pins on the plug the facelift tails should work fine on your model. I have LED tails on mine so no comment, but on my 03 I had to swap pins to make them work right as well.

As far as the Depo headlights go, that would drive me nuts. Did you hook up both triggers to the ECU and the footwells? If it were me I'd see if one of the trigger taps is loose at all.

As well, I'm not a huge fan of just tapping into the ECU and having the LED rings constantly on, there should be a pin coming off the LCM which you can tap and have them work as parking lights (factory operation).

Was your programming to the LCM done prior to the issues with the Depo headlights or after (basically want to know if your programming created an error with the dimmer switch)

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2018 Ram 2500 6.7L Cummins 68RFE
19k miles -Bright White/Black - Big Horn Sport - Crew Cab Short Bed
2013 X5 35D (CEO's) - Born on 5/17/2013 -
82k miles - Alpine White/Cinnamon Brown/Premium Pkg, Sport Activity/Premium Pkg and Sound/20" Style 214/Running Boards