With respect to any traditional IRA contribution, Roth conversion and the 401(k) rollover, it seems like you are getting a correct result, if not the desired result. It doesn't matter whether the 401(k)-to-traditional IRA rollover or the Roth conversion was done first, the result will be the same because the taxable and nontaxable amounts of the Roth conversion are required to be calculated using the year-end traditional IRA balance, not the balance at any other time during the year.
