Anthony,
This was my experience (others may have had different results). Note that I minimally pasteurize my milk before starting with the cheese making.
1) Rebekah Grace milk- I found the cheese to be excellent but very low yield - 2 small balls from a gallon of milk. I'm assuming that their low heat pasteurizing kills more than you want. So then I tried...
2) Raw Milk from Rainbow Blossom-It yielded more than double with the same amount of milk. Also excellent cheese- much richer and softer than store bought fresh mozzarella.
3) Cheese curd from Lots o Pasta- I got too cocky and (probably ) overworked the curd. Great yield, but the cheese was rubbery- okay for pizza but not what I want in a Caprese salad. Others (Heather Y. have had great results so I assume it was my error. They grudgingly sold me a small amount last summer but it was my understanding that you'd
only be able to get it in large quanities after that ( an open package spoils before they are able to sell it all), hence I haven't tried it again . I'd call to ask when/if you could buy a smaller quantity.
4) Any other milks you have tried? The raw milk my mother-in-law brought straight from the farm in Tennessee was a totally different animal.
I assume the fat content was super- high (or these were VERY happy cows). The cheese was even softer than the RB raw milk and pale yellow. Very rich and yummy, but not what I think of when I think of fresh mozzarella.
Hope this helps- Let me know how yours comes out.
Deby