Thanks! Ran through your method and Turbo Tax accepted it!
It had me print/mail 1 form, which was a Form 1040-V: Payment Voucher for the Federal Amount due on my "Mock" federal, which expectedly, doesn't match our other returns. Seeing as my partner and I filed federal as individuals, and our net difference came out with a Refund, not a payment, I'll try not mailing anything and see what happens.
