Is it exciting or is it painful? It may be because of my notable experience of mainly playing this role, but for me it's mostly painful and dull. At some point you know your limits, you reach you skill ceiling and thing becomes a chore. Just because it's stressful doesn't mean it's exciting. More importantly, it's not FUN.
At this point, im not sure what to tell you, its an emotional thing that comes from experience after all.
I can't just say, "oh you have to find the right people to play with" or "how bout experimenting with new things" because both are probably just bandaids you tried anyway and they fell off pretty quickly.
To me, the stress and Chaos when I engi for a good captain against Good enemies is what makes my job as an Engineer exciting.
To you, its just another match because you been through the same thing so many times.
Ill probably get to your point after 1 or 2 thousand matches.
Things just get old when you do the same thing over and over, be it food, games, sex, or Work.
The only thing that would fix that is just new content.
Something i hope muse gets around doing soon.