I have a similar goal of finding the best compact productive,very good tasting, disease resistant mango varieties.
I don't spray my trees. Not all the mangos that fit your original requirements are new Zill varieties.
Varieties I have for my yard are Florigon, Dwarf Hawaiian, Pickering, Edgar(seems to get black spot but ripens early enough that I haven't lost any fruit), Maha Chanok, Mun Khun See, White Pirie, Cac, Seacrest , Duncan, Buttercream, Nancy(closest I have seen to a Keitt replacement,beautiful purple red blush and huge fruit but done by late Aug.),Deloris, Sugarloaf, Cotton Candy( a better balanced mango than I expected,very sweet,has a little acidity and hint of coconut flavor),Little Gem. I will probably add Orange Sherbert,Honey Kiss and Super Alphonso.
How many of those have you tasted? I have tasted over half of the varieties I have planted and probably at least 50 others. With the varieties I have planted I have most of the flavor profiles from mild to wild covered and season from very early to very late.
I can live with a few trees that are less than compact but even those I will just prune more. I passed on buying Guava and Pina Colada trees locally in the past because they already seemed to have fungal problems and just did not look healthy in the nursery pots. I have tasted Dot from Pine Island nearby and I love it. I would have planted it but I am worried about fungal problems.