Help! Does anyone use a Brother PE770?

I am having the worst time embroidering on knit. I've changed needles (I am using a ball point) and used different stabilizers. I've used a sticky bottom stabilizer with a water soluble topper, I've used a cut away for knits with the same water soluble topper. I've played around with the tension some but I'm not too sure about that. Everything I read says to leave it on 00. I'm not hooping the fabric. My thread will break and bunch up inside the machine. I tried the same design on a regular cotton material and it stitched out fine. That tells me it user error! I know it can be done and I can't wait until I figure out how! Thanks for any input :)