I am right handed and a Goofy foot as well. My best gybes are on starboard, and this is mostly from my wave sailing.
When wave sailing, I found I put more effort into carving gybes on the inside (starboard gybe exiting on port) to keep me planning back out through the shore break to get jumps, where as out the back I would normally snap a gybe around (not usually a planning gybe) when I found a wave that I wanted to catch. I think the snapping gybe was easiest for me in the early days because the water was a lot rougher out the back so transitioning with a snap gave me close to a 100% success rate. And that is just the way I sail my local beach to this day. Interesting when you study it, because I have never thought about it until your question.
At LG this year, I noticed that really enjoyed carving gybes on both sides, but I was getting faster exits on Starboard gybes (despite the rougher water on starboard) and I put it down to better rig control initiated from the right hand.
Given the examples from yourself, Mike and I with differing outcomes, I am hypothesising that our best gybing side is a result of the most used sailing spot and what we perceive is the best/easiest gybing for that spot, and what you choose to put the most practice into (rather than handedness, or footedness

).