Burying vs flowers

This is my first SERIOUS year with pumpkins, so I am starting to bury
vines. (The weather in San Jose finally stopped being like what is going
on in New England, so there are vines!)
As I squatted there on my board, trowel in hand, I had this insight. If
I bury all the vines, then I will have a great root system, but no
flowers, and if I have no flowers, then why am I doing this at all?
So what is the procedure for burying vines and yet leaving vines to
produce flowers? Bury only secondaries, bury after fruit set? Bury x% of
everything?
Help please.

-- 
Give me a fast ship and a stout crew
For I mean to go in harm's way
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