Guild Wars 2

If you mean combos like field + finisher – I use it as possible. I got smoke bomb – blast stealth combo and fire field- blast 3 stacks of might combo. Not something to inflict a high amount of damage.
If you mean chained abilities, I try to use it too in possible synergies, like pry bar, static shot, concussion bomb (confusion stacking). Guess this is the thing everybody have to reach by himself, but if there are any written guides I’ll like to see it.

I also try to find build/stat set that will suit my playstyle. For now, it seems that I am only at the beginning of the road. I want to make tough roaming engineer with good healing and survival ability, able to kill foes in 1v1.
I like to use kits, so I want to have at least 2 kits in my repository (usually bomb and tool kits). Grenades seems boring to me, as well as rifle and utility bar full of elixires.
So I join and ask if there is good stat priority for such theme? I crave no crits, but sustainable damage with survival potential.
And so far, I meet 2 types of enemies on WvW – first type kills with 2-3 swings, or with 5-6 if I manage to react with gear shield, blind and distance disrupting. Another type are those, who quickly outheal my damage and then start to bring me to 10% HP. At this 10% HP fight can continue for a minute or more, I use healing skills many times and try to damage my opponent, but it is worthless – he is always full HP.
Any similar situations and, maybe, solutions what you had already found?