I have been finding the squatsnatch to be a tricky devil myself.
I think that good mastery of the OHS is key. If you can't OHS the weight securely, you can't sqsn it. Thus my heaviest snatch is about a halfsqsn because my pull power outguns my ability to sit and hold. So it's lots of OHS for form and strength for me in my plan now.
Hope this helps your quest for sqsnatch.