I gave my seed-started atalufo tree one more season to see if it flowered and it did not, so following the advice of some members, I took 75% of the down to top-work other varieties onto it:

It has some thick, healthy new branches that I'm ready to start grafting. There are 4 old branches, each old branch has about 4 to 8 new branches. I'm thinking about grafting a different mango variety onto each old branch. I have heard with cocktail mango trees one variety usually takes over, and also that placing varieties that ripen at different times can really stress the tree. With that in mind, I want to find varieties of about the same vigor with similar fruiting seasons. I have a spreadsheet that supposedly lists those attributes, but it's become obvious some of the information on there is less than reliable. Does anybody know of a reliable resource for that info?
Also, if anyone that has a bunch of varieties has any recommendations on the 4 varieties they would recommend, I'd welcome it. The atalufo wants to be a monster, so there will be plenty of vigor coming from the tree (which makes me think I should be going for low-vigor varieties). I'm torn between going for well-known, reliable producers or the new varieties on the scene. I'm right next to the gulf, plenty of heat and humidity with no risk of freeze or other inland issues.
Thanks!