I have recently played several games with the Forcemaster (my new favorite). One thing that was crucial to all of these games was getting the opponent mage into my zone... and keeping them there! Here are my thoughts on this.
In most cases the opponent mage will be either 2 zones away, 1 zone away, or in the same zone as your FM.
Case 1:
When they are 2 zones away, the best option is to use Teleport to move them to your zone. Then you can get a doublestrike in with Galvitar. If you are out of Teleport, the next best spell to use is Force Bash. This won't move them all the way into your zone, but it will move them 1 zone closer and incapacitate them, preventing them from moving further away. If you are out of Teleport and Force Bash, then just use Force Pull to move them 1 zone towards you.
Case 2:
When they are 1 zone away, the go-to spell should be Force Bash. Otherwise, use Force Pull. Force Bash is the go-to instead of Force Pull because it incapacitates the opponent mage, preventing them from moving away.
Case 3:
When they are in the same zone as your FM, you might feel like you don't have a job to do. However, you should do all you can to KEEP them there. The go-to spell for this situation is simply Knockdown. If you are out of Knockdown, use Force Hold instead.
So anyways, this is how I think when it comes to reeling the enemy mage in for punishment. Consequently, Teleport, Force Bash, and Force Pull are some of my most-used spells.