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In addition to Ice itself, make Ice types resist Ground.
Give more Ice types access to Freeze Dry and Aurora Veil, and slightly buff Freeze Dry to 75 Base Power.
Lower Icicle Crash's Base Power to 80, but buff its accuracy to 100% (Waterfall/Iron Head/Zing Zap clone)
While under Hail, no type other than Ice itself resists Ice type STAB. Now Ice types can fulfill their offensive role much more smoothly without being completely impeded by Fire, Water, and Steel types due to their usual lack of coverage options.
That's all you need. We have this thread every couple of days, can we stop now?