I think there's such a fine line between being assertive and coming across as aggressive...
I agree with
@WhiteBus that being too polite makes it easy for your SA to put you at the back of the queue but I'd be so worried about annoying my SA by coming across as too pushy and then destroying the pleasant relationship I've built with her so far... Does that make sense ?
But staying on topic - if you feel you've spent more than the "threshold" (and looking at your wishlist
@_queenbee it's quite reasonable) perhaps ask your SA for some indication on timing and whether your wishlist is too specific or doesn't tie in with the type of stock they're getting?
I have a feeling you'll get your dream bag by the end of the year though - the fact you were offered a surprise C18 is a good indicator the H gods like you xx