Demon Form's Demonflame debuffs

Hi.

Anyone know of a way to start Demonflame stacks at a higher number right as you activate Demon Form?

Its a little bit slow for mapping at start but doesn't matter so much as you can still kill stuff while gradually increasing in DPS but its kinda bad when you have only a boss fight to do and have to get in the room only to wait 2-3 mins to get enough stacks to actually engage the boss fight.

If there isnt any item that allow you to start at higher stacks there is a need for it, or just change the useless node Mastered Darkness to instead of having maximum 10 Demonflame having it start with say 50 Demonflame or have the node make you gain twice as fast Demonflame stacks or something.

I really enjoy Demon Form's mobility but it takes too much time getting to a point where you actually deal enough damage to do something in comparison to most other classes/ascendancies.