Twitch Passive Rework Concept

Twitch's passive, Deadly Venom, adds a stacking true damage over time effect to Twitch's attacks. It's also stacked via his W, Venom Cask and can be detonated for damage, though not consumed, with his E, Contaminate/Expunge. In basic terms what it does is add damage to Twitch's attacks that's unmitigatable - it's kinda like bonus AD. While this effect can be incredibly powerful, up to 216 true damage from 6 stacks - not counting refreshing the stacks, it's hard to appreciate this in game as Twitch or Twitch's opponent. This is because the damage shows up per application of the damage over time. Even 216 damage would only show up as 36 true damage per tick. This means Deadly Venom feels useless, while being incredibly powerful. This philosophy is echoed by Riot, as seen here.

I believe the root issue of Deadly Venom being unsatisfying while being powerful, is that it's an on hit passive damage over time effect. As an on hit damage over time effect, its numbers must be kept low to keep Twitch from being too powerful. It's similar to how aura effects are powerful because of their potential in teamfights, and therefore need low numbers to be balanced. As well, because Deadly Venom is a damage over time effect its numbers look low because the players are only being shown a fraction of the full effect of Deadly Venom, especially over long fights. While the idea of showing Deadly Venom damage cumulatively, the number increasing as damage is dealt, was turned down by Riot Wrekz for not adequately addressing the issue of satisfaction, I have another concept to propose.

Deadly Venom could be stacked via attacks and Venom Cask, and deal damage only when it reaches a certain number of stacks - similar to a mark being proc'd. This change would weaken Twitch's trading with few attacks, but would allow for Venom Cask to deal satisfying damage after a certain point rather than passively over time. As well, this would tone down Twitch's ambient damage and allow for his damage to be balanced more towards all ins, teamfights, and assassinations. I believe rioters have stated before that Twitch is overpowered because of the raw numbers in hit kit. Moving his damage from passively stacking on hit to larger bursts may help correct this issue. Whether this iteration of Deadly Venom would be proc'd by hitting the required number of stacks or by Venom Cask or Contaminate would be up to balance, as I could see a 6 mark poison effect leaving Twitch's Contaminate feeling rather lacking.

TL;DR I propose replacing Deadly Venom's DOT on hit with a mark on hit which procs at a certain number of stacks for the poison effect, creating a noticeable poison effect rather than a passive poison over a fight.