Sounds bang on lam666. With muley types you are likely to get more rather than less lambs so hopefully you won't have any overlarge singles. If you are maintaining such a good condition score on 1lb/head/day, fingers crossed you haven't any triplets - and if you do, the ewes are clearly coping at present.
Mules carrying texel lambs, especially twins and triplets, at this stage in their pregancy will need some additional sugar in one form or another; they can't get enough from grass alone at this time of year, and they can be prone to pregnancy toxaemia, so you will need to feed them cake or give them molasses or something. 1lb/head/day is a good ration when you don't know what they're carrying and their condition is 2.5 to 3.
I might be tempted to give them vitamins and minerals as well, just to be on the safe side. Either a block or a drench.
But it sounds like you are doing a grand job.