I went through your reviews and don't see any mention of Sweet Tart experience? Older forum member mention Sweet Tart as improved ZINC. I'm a big fan of Sweet Tart. Wondering why you chose one over another? Also you never described Angie?
Please try to describe Maha Chanok. I have my own opinion here, but wondering about your take.
I'm waiting for few more ripen including 3 ZINC's before my final top 10, but I can tell you already Nr. 1 does not match 
DL: I had to think about this myself and solved the mystery: I did taste a Sweet Tart but it was at Harry's tasting event...among 14 other varieties. I did not write any reviews from that tasting event based volume, time. The event was something to be experienced!
Thanks for the note on ST being a selection from ZINC (which is poly...). I was not able to compare the two directly. Chris at TT puts Zinc in her top 5. It makes my top 6. To make it a fair fight, I would need to have Ice Cream at the table - not one seemed to have any available this year. The only thing missing from my dream list which is pretty awesome!
Angie from memory is a good "mango tasting' mango. Mid sized, low fiber and an all around mango taste. On its own, it is a good mango. Up against the heavyweights, it goes to the back burner. No disrespect to Angie intended.
My memory of MC has faded since last year. Harry had one this year but I think it may have seen the fridge. It is always a good mango but the fridge takes its toll on any mango. From memory, it is a great dessert mango, often taking the top prize at Harry's events, which says a lot. But I must confess, after scores of mangoes....I must refresh my memory with experience....next year...