A longer time from rennet to cut would make your curd hold more whey, so a moister cheese. A smaller cut would make your curd release more whey, so a drier cheese. I think you evened yourself out on this, and it will be just fine. P/H milk often has a fragile curd, particularly at the outset, even with CaCl added. I use the handle of my skimmer to stir at first; and when I say stir, I mean very gently nudging the curd around until it starts to shed more whey and firm up, then I switch to the skimmer end and lift from the bottom.
It sounds like your rennet might be a little weak, try increasing the amount on the next make. Also, I dilute my rennet just before adding, in cold water. I have the idea that the rennet loses something from sitting and from getting warm - may be my imagination.
Dave in CT