Biggest crit with Shadowmourne?

I've been enjoying my feral cat, probably my favorite still, the best feeling is shooting out 20k crits back to back with shred.

Still wondering which of the three I'd like to get Shadowmourne on, on my three characters, they're all quite geared.

I know Warriors scale best with Shadowmourne, however, what I care about is a big number.

Singular.

Like one big 40k execute or something.

I know Scourge strike is a big number, and so is heart strike on an arpen maxed bdk dps

Maybe ret has another big one?

My biggest crits are around 31-32k on a BIS fury on pull with bloodthrist and whirlwind.