I've been testing pendulums in my fire rush (kartis's, the link is at the bottom of the first post, kartis is me btw...) and of the 5 Towers I originally had, 1 is now a pendulum. Ive had several times wehre i've wished it was a tower because I needed 1 more fire quanta, but then, even more times where i've wanted a tower to be a pendulum. As far as I can tell though, the fire quanta is much more important and for this deck, I might try 6 towers, 2 pendulums. Then try 5/3. 4/4 seems to be like too much. if you win in 5.4 turns, how many golems do you really need to keep up?