Right now its almost a no brainer which cata to take in your prep selection. Second wind greatly outweighs other choices, its the new TT in that slot. Move it over to blast phase cata's and switch it with Unstoppable. This way a person can choose some valuable prep choices.

Also I'd heavily advice to make second wind not allow full movement. The game doesn't need more chasing and hiding. Allowing for the continued full move+second winding just encourages this behavior. It is still a free 30 health in a down time moment or a save you in clutch situation, but no longer allows you to just sprint away from danger after such clutch healing to keep you alive.

Also make the energize prep cata last for 2 turns. It's gonna see no play otherwise.