Wobbly rockets are problem for me too. In KSP1 i just must have Kerbal Joint Reinforcement mod, and in KSP2 i use this method:
I expected that wobbly rockets will be eliminated in KSP2 but it is even worse, and without this "hack" it is not fun to even try to play in this game. I just want to fly to space in rocket, not a spaghetti noodle.