Try as much as possible to put less pressure on your chops when you play. A large amount of pressure will make it difficult for your lips to move from one note to another thus reducing mobility and flexibility. It will also force your embouchure to respond with an opposing force against the mouthpiece and you'll end up wasting valuable energy without knowing it.
Phillip Farkas had a great exercise to practice playing without pressure: he would put his horn on a table and try playing some note using only his embouchure without touching his instrument with his hands.
You probably don't need to go that far! I find that just being aware of how much pressure you are using is enough to notice when it's a bit too much. You can then adjust it to what you find reasonable.
I am associate principal horn of the Singapore Symphony Orchestra and the author of the progressive methods. I'm happy to share my experience as a horn player and teacher with you.