I know this won't help in this particular case, but it may be useful to others. When printing in a lab in the late 80's, I got a job that required printing a corner of a 35mm neg at 5x7, a section from a total enlargement close to 20x30 inches, perhaps slightly more. The lens in the enlarger when I took the job was an El Nikkor 50mm f:2.8, and by the time it was to that scale, there was so much astigmatism that I couldn't focus the corner of the negative. This was at any usable aperture, not just wide open. You could easily see the astigmatic "blur lines" in the grain flip from saggital to tangential without ever coming to focus. I dug around and found a 50mm f:4.5 Focotar buried in a drawer and tried it. It wasn't perfect, but the El Nikkor couldn't even produce a usable print in these circumstances, and the Focotar did just fine.
Enlarger lenses are, of course, optimized for certain reproduction ratios, and I'm sure not all Focotar models are created equal. This job was definitely outside the working range of the El Nikkor, but the Focotar held, and was good at smaller enlargements as well. I've used Componons of different vintages in my own darkroom and been happy with them.
Lee