I dont play in a hardcore no-lifer guild, but in a 2 days a week "hardcore" mythic guild.
Usually get to ~70 fury, then momentum and use Glaive+2xChaos Strike, depending on crit (refunds fury), get back to ~70, repeat.
This was the exact problem I was having. My uptime on Momo wasn't nearly at the 60% marker because of it. I would hover around 50-55%. Some fights of course a lot less because DPS is worse when I am dead. Anyway this information has helped out. Thanks you to everyone.
I was concerned cause I was only pulling 180-200k with 825 ilvl and that seemed low. Pure single target.