Alphonso flowers but it has a difficult time holding fruit to maturity in SoCal. From
my observation, you will be lucky to get 5 mature fruit on a 6 foot tall tree.
Alphonso is highly complex in flavor...many love that Indian piney flavor.
Ataulfo (common supermarket fruit) is not complex in flavor, hence it isn't highly prized by us mango snobs. It has a short window where it is ideal sweet and tart (right when it develops wrinkles). Otherwise it is too sour (green or yellow but unwrinkled) or just pure sweetness only (yellow and overly-wrinkled).
So would you reccomend grafting something new onto the alphonso tree? The tree has already been grafted at the base. Is it bad to regraft?
You can give Alphonso a try for a couple of years. Maybe you'll have better luck. Some spray Alphonso with KNO3 to induce more flowering.
I'm am interested to see how well Simon has done with Alphonso in Mira Mesa.
Some of my friends are looking at the following varieties to replace non-productive Alphonso:
Kesar, valcarrie, Julie, Carrie, ice cream, pirie, alampur baneshan, Bombay, Angie, ST Maui, neelkiran, jehangir, son pari, and a few others. These all have a similar piney flavor. We are still experimenting with these varieties (productivity and disease resistance in SoCal) so I can't recommend topworking Alphonso with any of these piney varieties yet.