Not a guide per se. But here are some tipps on how to come close to a 5x Multiplicator.
1) dont get hectic when an ice column reaches the top, you can be pretty sure, if you focus on getting Bejeweled explosions, that at least one explosion will tear this column down, at least a bit
2) almost ignore ice colums and try to play this as a normal Bejeweled game against the ticking clock. (Believe me, the first time i played it, i got to 4xMultiplicator by only focussing on getting colums and rows down. The second time i focussed on the ice towers and i didnt even get to a 3x multiplicator because the ice columns distract you from seeing possible stones which can be combined together)
3) dont pay attention o the multiplicator and think " Yes i am already 4 so nothing can happen. Believe me the unexpected will happen if you let your guard down
4) Be fast and efficient. Three stones out of the way in 1 second are better then 6 stones in 12 seconds, you know what i mean.