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Looks to me like you are set up for, and maybe not escaping,

"hiccup mode". I see what looks like a boot winding diode-

OR'd to Vcc, and a skinnky 50K pullup. So every time you

cross UVLO rising, you get one "yip" out the back which (you

hope) will pump the bypass cap hard enough to not hit UVLO

again on the bleed-out.

But I don't know if you can k-couple three inductors at once

(see only one k factor, think got three windingss there ought

to be at least three coupling factors?). The boot winding has the

same L as the output winding and if that's for 5V, will not produce

enough to rectify and get >8V to keep out of UVLO.

Look to that (bootstrep charging) branch and see if it's pulling

its weight.