the stock math and strategy on everything regarding barometric pressure in VE should do a really good job above sea level if you floor it occasionally while driving through the mountains, which any human being with a heart and soul is bound to do. i wouldn't touch any of that stuff.

where things have gone wonky for me with barometric updates is if you floor it, and your air intake is restricted in some way, that's your new (false) baro pressure. if you have a dirty air filter you could easily be out a few kpa from the key on engine off baro init. can't really calibrate for that, though.