Batya, there is nothing wrong with cutting a plant all the way back to start anew....doing so for the reasons you've mentioned is a great idea! Yes, it's not the ideal time but when you weigh the pros and the cons, I vote for CHOP!

Along with the pruning, please attend to housekeeping issues around the plants by removing fallen plant debris, etc. Make sure that the sage has plenty of space for good air circulation and sunlight penetration.

I'd suggest that you don't fertilize these plants after pruning, but let them rebound from the energy in their root systems. Keep them properly watered, though. Keep a close eye out for the same pest problems and nip it in the bud right away.

I agree. Clipping does sound like the best course of action. I would water a little more than the established plants usually require for your location/time of year to give them the best chance of bouncing back. Good luck!

FataMorgana