Guild Wars 2

Im currently a lvl 50 engineer, and mostly use the 2 explosive kits to deal damage. Looking for advice on how to increase the damage output and possibly what traits/kits to use

Direct damage or condition damage, which ever you chose to focus on, work spectacular either way with precision.

No one can really help you to a very useful extent, until you toss in some details. Do you use P/P, P/S, or rifle with them?

I use P/P but i rarely actually use them, because grenades and bombs do more damage

Well it gets even better. At level 60 the obvious choice is to get the Grenadier trait : 1500 range and +1 grenade per throw.
For the rest, I tend to focus on survival (elixir gun, elixir R, backpack regenator trait), but you can also go for more power instead (elixir B, HGH trait).