I got a fair amount of mangoes, but quite a few went bad during the ripening process. Got a lot of rain in early June, before the fruit were fully ripe, and that may have had something to do with it.
Angie, Fairchild, Pickering, Providence and Honey Kiss were good producers. Mahachanok was moderate. Mallika was poor. Cogshall and NDM were the worst: produced fruit that almost all went bad. They're on my hit list now. The NDM will have a Pickering grafted on to its trunk when a friend has the time to do so. Haven't decided what to graft on to Cogshall - Providence is the top contender for now.
Your experience with and confidence in the Providence mango is interesting in light of its supposed vulnerability to MBBS and the general abandonment of that variety in this area. Obviously it's doing well for you, and you like it enough to want to topwork another tree to it. My tree hasn't produced yet, but I guess the best course of action is to wait and see if it produces healthy fruit.
How old is your Providence? I planted mine in Jan. 2015, and it fruited for the first time (about 25 mangoes) in 2018, and again this year (around 40). The mangoes are large, but better than that, the taste is to my liking. A bit scruffy this year, with black spots on the skin, but taste was excellent. I'm no connoisseur; I like my Pickering, Providence, Angie, Fairchild and Honey Kiss. The MC isn't bad, but it's quite vigorous and so more work than I need to keep it at a reasonable size.