OK, got my reading glasses on now. 2 minutes may be too long to stir after adding rennet. I stir in my rennet with 30 up and down strokes with my strainer, less than 1 minute, closer to a half minute. Too much agitation in stirring the rennet can make it form a weak gel, as I learned by experience. I've also found that I have to be much more gentle than I think when stirring. Too many years of metal work, I guess. Had to learn the touch for milk.
Dave in CT