And one more point. The error in my return is, of course, entirely my own fault.
I conflated 'withholding' and 'estimate'. This is likely because when doing the conversion I had the choice of withholding x% or zero. I chose zero because I was paying with "outside funds". However, my brain retained the word 'withholding' and I did not realize that Estimate is a distinctly different concept. At that point I started looking around TTax for where to enter the 'withholding'. Oh well, hopefully this lesson will be retained.
