I would suggest using Pot1 first, while filling up your tax bracket with Roth conversions. This hopefully gets some of your tIRA money into the Roth with a low tax hit since your income should otherwise be very low. There is a 5 year waiting period after a Roth conversion before you can withdraw it.
If you don't need to sell all of the stock in Pot1 right away, you might also be able to take advantage of 0% capital gains tax rate at low income levels. Can you sell it a little bit at a time? Diversification is also a big concern there, so maybe sell most now and the rest over a couple of years.
Generally after that you want to fill your tax bracket with tIRA withdrawals and then meet the rest of your needs with Roth withdrawals. Again, just trying to get the maximum out of your tIRA with the lowest taxes.
That's the big picture, but the amount of funds in each type of account and your withdrawal needs will dictate how they interact with the tax brackets, making it difficult to give detailed advice. You might try www.i-orp.com
for a calculator that will give you more specifics.