Ok I finally managed to find these guys, after searching and searching and searching. Must say you guys directions weren't all that exact.
If you head past the bar where Jack Sparrow, along that path, keep to your left. The path goes into the jungle. In the jungle, to your right is the grave yard. But we go to the left. Run past the skele's, scorpians, aligators till your reach the cave at the back. Again, more jungle. Keep running, don't stop to fight. Head past the navy guards (about 2-3 of them), past more skeletons and you should find another cave.
This is the cave I found 2 EITC soldiers. 1 called Thug (lvl 10) the other called Grunt (lvl 10).
Now I had 3 elixirs with me, equipped at F4. (The forth slot in my inventory).
Got the attention of 1 of the EITC guards, lured him away from the other one and took him on. Half way when my life was depleted, I used 1 of the elixirs. I advise not to wait till your life is in the red.
Should be able to finish him off in no time.
I am lvl 7 pirate with lvl 6 cutlass. Good luck to you guys. Hope my instructions were a little clearer to finding these guys.