I too would LOVE to know how you care for your mango trees to get such amazing growth in CA on turpentine rootstock!?!
I know you mentioned that you bought 7G trees. Did you let them fruit in the first year after planting?
Please tell us your secrets!
I've got VP, Glenn, LZ, PPK, Sweet Tart, Phoenix, and Fruit Punch. I've also got Carrie and Malika, but I think I might need to graft the Carrie and Malika onto my mature Manila and lose the trees on the turpentine. For me, they just flower too much and don't grow vegetatively (not vigorous enough varieties in my area?). Will probably replace with Keitt, Haden, and Gold Nugget on Manila rootstock.
Cyndie