After you file

the quickest way is to wait until TurboTax releases the 1040X, and e-file.  If you try to do the paper route on the IRS site, it will be bogged down.  I have a similar situation, and have been waiting for this form to be released.  Although I really don't get why TurboTax is taking so long to release a form that the IRS has offered on their site for weeks now.   Hopefully on March 18th, we will all have it uploaded to our software and can continue with our amendments.