Regenerative mob grazing with sheep

Hi I'm looking for anyone doing regenerative tall grass mob grazing just with sheep.  So many of the studies, research & examples are either just cattle or cattle with sheep. I've been doing this with my primitive sheep for 3 years now and I'm very pleased with the results in terms of soil improvement, especially water infiltration on our wet land, and of course increase in biodiversity at all levels on the farm.  But I've been warned that the grazing preferences of the sheep could create problems in future, so I'd be interested to find out about the experiences of other people using a similar management system.