I think that ice slick should impose a hefty -to hit debuff to affected mobs. I can’t imagine standing (used loosely) on a surface slick enough to cause one to slip repeatedly, would still allow one to attack with pin point accuracy. Adding this will allow ice to close the gap with other control sets even more so than with the change to shiver (cold snap), while still maintaining its identity as a set excelling at soft control.
Also, I think that the damage component should either be removed, or have a higher, enhanceable value. As it is now, it serves no purpose, and has detrimental side effects on anything sleeping (flash freeze).