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Hi, its finished now...at least as much as it can be.....if you give spec i will do more for you.

Did you manage to put the TL431 .model into the LTspice sim?...i sent you the .model statement and the symbol above.

The shape of the Vcc voltage you mean...?....it gets charged by your startup resistor at first, then the bias coil kicks in.

It is in nice DCM for you now....which is best for offline flyback.

It takes a lot longer to sim with the leakage L in there...so ill leave you to do that if its ok...chime in if you want more help.

Is this satisfactory for you?...or you dont like it?