Nice idea! But I think doubling the cooldown is a bit too much, maybe plus 5 or 8 minutes..Anyway, it really sounds cool, especially with that background.
i dont know, maybe i think doubleing it would be worth it due to the fact it makes you addicted 100% of the time you take it, there is no antidote other then waiting it off, which i would imagine to be extremely annoying due to the effects of withdral, maybe a increase of 50% your normal gathering time would be ok if people are to sceptic with gathering balance, but i dont think only +6 or +8 minutes would be worth the addiction