I have run
opensocialsecurity.org and it tells me to collect at 70 and my wife at 62. This is so she gets the higher check after I die.
But this leaves out the idea that we want to maximize Roth Conversions.
If we have to add in her SS, that will reduce the amount we can Roth Convert and stay in a lower ta bracket. So I question whether it might be better to delay her SS until 70 so we can keep maximizing Roth Conversions in a low tax bracket.
Someone needs to develop a calculator that will compare taking SS or not, taking vs delaying SS, Doing Roths in 12% and 22% brackets, Doing Roth Conversions or not and RMDs. And output taxable and non taxable networth.
Creating some way to get an answer.
There's waaay too many variables there for someone to do all the work for you, but there are tools out there that would let you do these kinds of studies yourself.
Where I recommend starting is i-orp.com (scroll down to Extended Input), its tax model has some gaps (last I checked it used the current year income instead of 2 years prior for IRMAA, no AMT, no NIIT), but it gives a whole life plan from some simple inputs. You would then run various cases with different SS claim ages and different inputs for Partial Roth conversions. It's designed to tell you how much you can spend each year and end up at zero at end of life, if you want to leave an estate, you enter your desired amount as Plan Surplus.
If you are spreadsheet savvy, you can use the Bogleheads Retiree Portfolio Model that is free at their wiki. It is more flexible in year by year entries, but everything is manual, so you would have work out your own plan. Personally, I find the input layout a little confusing and it still has some tax gaps like AMT (that can bite singles pretty easily), existing capital gains, HSAs, non-deductible contributions to t-IRAs. The new beta has a cool feature that allows you to see what happens if you put your bonds in your traditional IRA and your stocks in taxable and Roth - in general you don't need to convert as much to Roths when you do that.
Of the programs I've used, Pralana Gold ($99 1st year, $49 renewal, requires Excel, no substitutes) has the best tax model and flexibility. It has a huge amount of flexibilty, good menus and a good manual. Not as automated as i-orp, but much more automated than RPM. Some things are quite easy, for instance, you can set up your Roth conversions to a certain tax bracket/IRMAA tier and test different SS claim ages at the click of a button, or just scroll over the graph and see the percent of the optimum that different ages give you. You didn't mention ACA, but based on income and your Roth conversion inputs, it will decide if you should limit Roth conversions to get ACA subsidies. I feel like I've used it heavily and there are are still sections like withdrawal strategies, Rental Property and various Life Insurance options that I've never even clicked on.
So short of hiring an advisor, there are some workable options to give you the answers you want, though it will take effort.