dweb switch works just fine with guided arrow + venom.

just venom has a short duration and the -50% is only active while dweb is active, so you gotta be nice with switching at the right time.
skills other than guided its not worth it cause of the short duration so you dont gain much by switching, its not like rabies where you can hit then switch and it takes a long time. dweb is good as the active weapon while kicking with dtalon tho.

so.. open wounds .. how much damage does one open wound do?

Depends on your level.

I have heard it is around 2k for a high char.. and that it does damage over 8-9 seconds..

Open wounds is obviously more effective than venom for dueling certain classes, I'm not sure since you assumed perfect tri-ww's that you've proved anything with your math. If you were to use SS skillers, ok, maybe don't max venom and rather invest into something else (mostly MB, if hybrid) but if not, what the fuck else choice do you have, seriously? Certainly poison charms won't work since they average, and there's not much else you can invest in other than CM/MB. MB seems like a waste on a hybrid, as does CM. You're not really making any breakthrough discoveries, the cookie cutter build is the cookie cutter build for a reason, you just outlined why OW is > poison.

max/ar/lifers?

And honestly, how would maxing MB ever be a waste?

um4de?

yea, the only skill it works with after the psn hits is rabies, but its becouse rabies is more like "aura" that keeps reapplying the poison. when you swap to dweb it "updates" the psn damage and -resists and reapplies the psn with those values

it doesnt work for any other psn attack _after_ you have hit, but like said before if you swap to dweb _before_ it hits then it works (basicly ranged attacks are the only choice)

I don't see physical damage can be that good on a ww assassin when I consider the base claw damage.
maxed venom is obviously not that great either.
open wounds..

a ww assassin can really take a lot of life.. so I guess these three factors works fine in conjunction

it is the combination... but a good phys ghost packs a punch without venom/ow (theoretically... a ghost should always max venom.)