130 cade lambs .... the farmer must be lambing a HUGE number of ewes! Your problem maybe what he is not doing rather than what you are..... lambing 1000's means it is unlikely everything is done properly ... the triplet taken off (which I am assuming most of yours are) may never have had colostrum so has no immunity at all.
My other observation was you said, I think, that straw was over a foot deep in after just 2 weeks .... that sounds like a huge amount of straw to me. I know my shed is earth floored so drains but I don't have a foot deep after having ewes in for over a month.
losing lambs in numbers is very hard on you.