I like going right hand spinning left. I feel when I grab with my left hand, I have a harder time looking around my shoulder and I don't get enough rotation.
The best way to lock in grabs is to just try them. Get them down on easier tricks like 1's and 3's and then take them to you bigger ones.
"It is better to go skiing and think of God, than go to church and think of sport."
- Fridtjof Nansen