Problem with making Tox OGCD is that it removes SGE's mobility tool. As bad as it is having 'scuffed ruin 2', the alternative that changing it to OGCD would bring is 'no ruin 2 at all', and we'd be as immobile as AST. At least WHM can use Lilies for movement, kinda

and doubling it's potency raises the crit variance of the skill. 660 is quite a lot of potency, we can already see the swing on a Phlegma going between a regular hit of like 26k, and a Dhit Crit of like 50k or even higher