I doubt it.
Do you use high test gas? The car will retime itself for crummy gas and take away a bunch of power in the process. It senses pinging through the two knock sensors and times each cylinder separately retarded till the pings go away. It does this at levels way below human hearing so it isn't noticed. Just a thought.
All the other things you mention would cause single cylinder misfires which would also reduce power, but your description doesn't sound like misfires just that you want more power.
Bosch Master, ASE Master, L1
33 years MB technician