1. Use a grip that keeps the racquet out in front of you (at the point of contact) on both sides. (base thumb knuckle on bevel 8 for backhand, bevel 2 for two hand forehand).
2. Hit pretty flat or slice on ROS
3. Then next shot you can try to really rip the topspin, unless it's a high ball or very short ball, for a high ball hit flat or slice, also really try to run around the backhand as flat high two hand forehand is best shot. For really short balls, obviously slice. Otherwise though, this is the shot of to probably try to really rip it with topspin.
4. On ball toss. Cup it in your palm. Avoid touching it with fingers.

Done use a single string method. The tension ends up the same for mains and crosses no matter what.

I tried the Gene Mayer style but while using a Murray backhand grip and that way at least I wasn't happy with it. My regular two hand forehand is just so much stronger. Oh well. Maybe I'll mess around with it later using the 8/2 bevel out in front grip.