Interesting idea. However, don't you think that the two versions (upped ad unupped) are too different in terms of balance?
Density Wizard has 7 attack, so with a 25% reducion (75% of 7) this would be an [7 x (75/100)] = 5.25 => 5 attack, and doubled it would be 10 damage overall, and since it is divided in two seperate attacks, shields would absorb more. But I guess this ability is going to be used only if the opponent has not any damage reducing shields at all.
About Density Sorcerer, this would be an [10 x (75/100)] = 7.5 => 7 or 8 attack, and doubled it would be 14 or 16 damage overall, which is much better than the unupped version, according to my personal opinion always.
What about Adrenaline? A creature with these stats buffed with Adrenaline/Epinephrine will attack twice with a normal attack and with its activated ability would attack four times per turn, which can become really powerful. Don't forget that double attacks makes effects like freeze and delay to be removed faster (however they increase the poison gaining as well).