We're not as hign as you, but much further north, so probably comparable?
We were told to select a Charollais tup with plenty of wool on his head, then he'd give lambs with more wool than a smooth-headed tup. Seemed to work for us.
We bred one Charollais cross ewe back to the Charollais, just to see - cracking lambs, but too bare for up here. But the first crosses, and their daughters from the Dutch Texel, were fine. Finer-skinned than our other sheep, for sure, but sufficiently covered to cope with our weather.
We lamb outdoors, and the Charollais lambs, and lambs from the Charollais cross ewes, do have less fluff on them at birth than the Texels. But this means they squirt out more easily, are very lively on landing, and get straight round to the milk bar for that crucial warming first feed. Whereas some of the Texels can be a bit more dopey, possibly partly due to taking longer to get born, so take longer to get that first feed. In really cold wet weather, we'd bring in any newborns for a warm dry first night, and in anything other than horrid weather, the Charollais lambs are fine. We do jacket any fine-skinned lambs if cold wet weather is expected.
The Dutch Texel, when first (re)imported, was finer fleeced, finer boned, smaller headed, and narrower shouldered than the by then prevalent anglicised Texel. Ours gave smaller lambs at birth but which grew on really well, which we think is ideal!
However, our second DT tup was quite a bit bulkier, and his fleece rather less fine, and he was the best we could find. His lambs were great though, and again were born small but grew really well, finishing with top grades for conformation.
We've not bought a third DT tup, as they now seem to have been bred up to be as massive as the regular Texel
