Thank you, cbreemer, for listening and for your comments. Yes, one can and should alway strive to increase dynamic range, and I have been doing so in my rehearsals. Your other suggestions were also easily integrated. I look forward to your own polished recording of 109, I'm sure you'll do much better than I.
I disagree, however, with your comments regarding the tempos of the fugues in Var. 3 and 5. Tempos are an individual choice, and too rapid a pace can lose or blur much polyphony, at least in my hands. I'll let the tempos increase as they will, given accuracy concerns and clarity, thank you very much.