im not sure what totems are u reffering to
ToW = 160 dmg, and 3% crit "debuff" on monsters in range
flametongue totem, talented = 165dmg, and not weapon imbue
also, fel armor is selfbuff, its different, demonic pact is counterpart to ToW, and its 10% of lock SP, simply scalling with better gear, and already better on t7 raid levels, so i dont see, why ToW shouldnt be also 8-10% of our SP, prolly 10%, since we tend to have abit less SP than locks, and to fel armor, u didnt noticed the part, when its increasing spelldmg based on spirit?
chack it out
http://wotlk.wowhead.com/?spell=47893