I think there's a good case to be made for traditional contributions here, as you do have a high income and will be ineligible to deduct traditional IRA contributions going forward.
The main thing to look at in this Roth vs. traditional thing is your current marginal tax rate vs. your marginal tax rate at retirement.
Your retirement tax bracket is determined, to a large extent, by your retirement spending. However, as long as you don't have a pension or something else that would pay you more than you plan to spend, your spending basically acts as an upper bound to your income. Roth withdrawals generally don't count as income, nor do HSA withdrawals. Withdrawals from a taxable account only count as income to the extent that the sale price exceeds the cost basis, and even then you get a special tax rate on it.
Projecting your career forward, you should expect that you'll be able to max out a traditional 401(k) and a Roth IRA each year (Roth IRA because you'll earn too much for traditional), plus whatever extra money will go into taxable. The more frugal you are, the more you'll end up putting in taxable, and this will in turn decrease the fraction of your savings that will live in traditional retirement accounts.
In general you'll be the most tax-efficient during retirement by smoothing your income out as much as possible from year to year. For example you'll usually do better withdrawing $20k from traditional and $20k from Roth each year rather than alternating years of withdrawing $40k from traditional and $40k from Roth.
Given that, you should assume that your withdrawals each year would generally match your overall portfolio: if you retire with 50% in taxable, 30% in traditional, and 20% in Roth, that's probably pretty close to your optimal withdrawal ratio.
Let's get back to marginal tax rates. Again, what you should do this year is mostly determined by how you expect your current marginal tax rate compares to what your marginal tax rate will be in retirement. Currently you're at 15%. If you expect to have the same tax rate in retirement, you can go either way with this year's contributions. But notice how the higher your income and savings rate, the lower your traditional retirement accounts will be as a percentage of your overall portfolio. With only a third of your money in traditional, you can rack up some pretty anti-Mustachian spending during retirement without even hitting the 15% bracket, and you'll have to go pretty wild to hit 25%.