Doctor Archive

I'm currently a master combat medic and planning to do some doctor skills. I was wondering if the enhance medpack d's are a bigger step then the c's. I know in master cm, the C's for our poisons are a must and the b's shouldn't be bothered with if you want to be effective. Anyways, can i get by on just using enhance c's? I'm only asking this because due to lack off skill points i would have to give up my fwg5 certification to get master doctor as well....

C's average 250-800 buff. (Really good ones push the 1,000 mark)

D's average 500-1500 buff. (Really good one's push the 2,000 mark)

YES, D's are worth it. =)