Good point, but for MM it is always up. We put it up once and then Chimera shot keeps it up the whole time.

As a rule MM Hunters will find Serpent sting being refreshed with every Chimera Shot, so unless you are target switching a lot, moving out of range etc then you should have close to 100% uptime on Serpent Sting.

Obviously BM and SV don't get the refresh with Chimera, so their uptime will be a little lower as SrS isn't high on the priority list (as you note) but its uptime should still, theoretically, be very high.

Shows how much I go MM, completely forgot about Chimera Shot.

/D'oh

At least for SV my point still stands, I originally left out BM because I have no clue what the priority on Serpent Sting is for them.

You want to have serpent sting up as much as possible if you have Noxious Stings Rank 3
If Wyvern Sting is dispelled, the dispeller is also afflicted by Wyvern Sting lasting 50% of the duration remaining,


-and increases all damage done by you on targets afflicted by your Serpent Sting by 3%.-

So you want serpent sting up, unless you really do not like 3% extra damage. I mean it is your choice.