you could definitely swap a pendulum for another rage potion or an extra deflagration.
on steam machine decks, it is important to know when to stop feeding the machines so your can be directed to your support cards. its not vital to feed your machines every turn if it means you getting rid of a shield or an annoying creature. Also, take in consideration that rage potion can also be used as a sudden attack boost for your machines, although it should only be used in the last turns because it will render your machine very vulnerable to all CC
But swapping pends would put too much strain on water quanta imo. If
is the problem quanta, then I'd take out a pend or two, add a water pillar and a rage/deflag, as you need it, since
is running a QI of 5 as is (and SM decks are neither overly rushy or overly stall-y, so 5 works imo).
That being said, it is true that you can use CC/PC instead of pumping your steamies, but ideally, one would do both, in which case is removing quanta sources really the right option? Really, the card to replace MIGHT be the second ice shield...just food for thought.