You probably just haven’t played against someone who is good at it like Legolas or Kuddel.
Yes, that’s quite possible. Maybe it should indeed be increases if you think the best trigger players get way much more powerful than with e.g. time bomb (which also can be played in a way if one has a skill that there is no action you can possibly take to run away from its radius with the exception of players having speed burst). On non-top level, though, I don’t think trigger is a powerful weapon at all, so it might be hard to balance it in a way that would be consistent for players of all levels.
Steerless fever shouldnt cost more energy, it just shouldnt last as long.
You’re right, the unchanged steerless but working shorter would be a better solution.
speedy fever is steerless + speed boost and that costs 2 energy.
I think there was a lot of feedback from players that speedy fever should only increase speed and give a small increase to radius turn (like it was in cf2 and cf3). I hope this will be changed after more important bugs are fixed, after which speedy would not be strictly more powerful (plus iirc it also lasts way shorter than steerless, vide your previous point).