What ewes are you running and ram are you using now Granny? This bloke lives further in land (up near the wind mills other side of Newcastle Emlyn) he is over 1000 feet and uses them on Welsh lambing outside in April.
He uploaded the photo to the Charmoise Sheep Breeders facebook site with the words "easy lambing" which was nice. He also came back and bought a second ram. Which was nicer.
They are tough, IME beat the pants of a Charollais, Suffolk etc but don't have a thick coat at birth, they are very fast on their feet and suckling but cannot make the sun shine. They are a hill breed, but with muscles. If you need a full on hill breed to withstand your conditions use a Welsh and accept they wont sell well, your place sounds much the same as here though, my sheep are looking at Ireland when its not raining
We sold 20 Lleyn (small ewes) cross Charmoise today in Cardigan and had 1.50 per kg, which given the trade (143ppk av.) and that we aren't FA I thought was pretty good.