Unproductive Cogshall. . .Any Ideas Why?

[Carbo]

My Cogshall has been inground for about 6 years, transplanted from a 3 gallon pot.  For the first two years it produced no fruit, in part because I wanted it to grow and I fed it accordingly.  Two years ago I pulled my first 9 mangoes off the tree.  Hallelujah!  Visions of a bumper crop in my head for the next season.  Well, the next season was a dud: 2 fruits.  Finally, last summer was an awakening, with 70 mangoes to harvest.
This season, so far at least, looks like another dud.  Today I counted but 15 pannicles on the tree, with a few branches looking like they are ready to push out some more.  But driving around my neighborhood I am seeing mango tree after mango tree covered with flowers already.
To my knowledge, the Cogshall is not a shy bearer.  The tree is in sunlight almost all day.  Last year I fed it once a month with some 8-3-9,  and sprayed some minors on the tree monthly.  Did this from about March through September.  In October and November I sprinkled it with some 0-0-50.  I haven't fed it since.
I've attached some photos which show the few pannicles, but also shows a few of the pannicles that either died shortly after opening or are stunted.
Any ideas?  Thank you.

[Bananimal]

My Cogshall is doing great after 2 years in ground.  Came from Excalibur. 

West side view --- loaded with big panicles.



South side view



Little mangos forming


Haven't put anything down yet this year.  I fert monthly with 6-3-16 with minors from Diamond R.  February to November.
No signs of drop off, disease or panicle wilt.  Except when my new Min Pin eats the lower buds.

[Sleepdoc]

There is still some winter left with more cold mornings to go.  It may have a second bloom before spring.

That being said, you could consider cessation of N feeding altogether or stop in July or August.  I don't give N to trees over 5 years old.  Another thing would be to stop irrigating the tree, if you are at this point letting it get hit with supplemental water.

[zands]

Straight potassium helps fruiting I think. Plus maybe a heavy wood chip mulch would supply what it needs

[Carbo]

Sleepdoc, zands. . .I haven't watered the tree in months.  I figured that by now it is well established and there's no need for supplemental watering.  Plus, it's been a wetter than usual dry season.
I think I'm going to forego all nitrogen this season.  I'll just spray with some minors during the summer months, and hit it with 0-0-50 starting in September.

[FlyingFoxFruits]

i would say don't fertilize the tree at all...unless it's showing deficiency...you could be over feeding it.

also, it could just be that the season was poor due to weather conditions.