Personally, I've found that its best to stick with single element weapons on Medic. Every element gets -30%, which means you get -60% with two and -90% with all three. I can't possibly understand why anyone would use prismatic crystals with a Medic as you'll be killing 90% of your damage out put from the get go. I'm not saying pick one element and go with it, but pick weapons that use only one element a piece. I see a lot of people using things like stickies and I can understand why with its high rate of fire, but that's not so much the case with other multi-element weapons in my observation. Currently, my medic is using Boomarang, Algae Nova, Shadow Flames, PSG and Teleport. I know you're not using TP, but I do and it serves me well. That being said, you obviously want to get a larger damage output and the best way to do that with a Medic is to use RoF and Flat damage arts. I know my weapon set up isn't the best, but its pretty much the best for what I currently have, as I don't do PVP, so I have no real way to get troons, so I can't get the hunter killer or whatever else that everyone suggests. I like the boomerang for its wide arching kill zone and the fact that it covers more than 50% of the screen in rapid fire succession. I like Algae Nova because its a single element nova with a large radius and a fairly high damage capacity, plus it has a resistance reduction for my other main weapon, PSG. Using A.N. and PSG together, you get a wide area of DOT going with all the enemies taking more damage from your PSG as you fly through the mobs. For over the top fast damage, though, I use shadow flames. With the increased rate of fire and some good flat arts, it literally burns enemies to nothing. Everyone has a different style and this is the one that works for my medic. I hope it helps yours at least a little.