The extreme wet the last 2 years here, and where you are
@Mike CHS, is not something that you can use as a good guide for culling etc. My son sold quite a few sheep last year, partly due to the wet weather and all the worm and feet problems he was having, plus just not having enough time to do things the way they should be with the way we were changing what/how we were managing our cattle and keeping weaned calves and such. Plus, the market for the rams has really decreased. With his breaking his hip, and all the scrambling we did to get things put together to do feeding and all, it is a good thing the sheep numbers are down. We are still seeing problems with worms and the feet, and it is still very difficult for him to try to do feet trimming. Maybe by next year he will be back to his strength to do things better.
We have had a couple of nights in the 20's, now 40's and days are supposed to be in the 60's, then 40's , then back up. Worst weather for them. May just dry lot them and feed hay for a bit, so that they aren't picking up and managing to ingest worm eggs or even larvae that might hatch in this crazy "winter" that isn't really a winter. You are further south so probably will have an earlier spring than us.
I think your worming program is very good and you can only do so much while having this crazy weather. Maybe cutting back will help, but I think that it might only cut into the "income side" of your sheep since you get good prices for the lambs. I am not sure that reducing the numbers on the land will help the worm problems so much with this wet weather. You have some really nice looking ewes, and get very good growth on the lambs. Maybe just doing a little more frequent worming- which I know you are trying to breed more resistant ones - and keeping your numbers up where you are getting a good return until the weather gets to a more normal pattern. The weather will change, we might be getting into a warmer pattern, but remember not 20 years ago the severe droughts in Texas, and the droughts out in the midwest just a few years ago.
Hate to see you sell too many and lose the progress you are making.