Two amend questions on both Federal and state

Filed and asked refund 10 days ago:

Federal: received (not approved yet)

State: refunded 

 

Electronically amended today and I chose to pay the due from my bank account in May:

(refund is more than due)

Q1: Will Federal refund the difference or they refund the amount of my first tax return and withdraw the due from my bank account later in May?

 

Q2: TurboTax asks me to print 525-TV and mail with my payment however I chose to pay from my bank account, so is it correct that I just mail 525-TV or I don't need to do anything at this part?