Just playing like you do no variation and only using a Clone when its safe and you got plus frames in the corner, or every now and again just randomly surprising your opponent with it in the neutral, and bam.
Sub is cool with his variations. They all just "add" different buffs or tools to the character without changing him fundamentally, unlike say Kenshi. If you get super comfortable playing with no variation, your neutral game will be really insane and adding to it by ramping your damage up, or never taking chip damage, or having corner jail, could only do wonders. Stick with no variation as long as you want, but once you are super comfortable I'd switch variation.
PS Cryo doesn't really add anything very unsafe, so if thats your worry you could always play him. As Lokheit said, it sounds like the added tools are making you PLAY unsafely, which is really unnecessary - play like you normally would and just take your extra 15% on combos
The only change youd really need to work into your neutral is EX-Hammer for armouring through pokes or whatever else.