I gave Baloroc some more trys.
After 8 trys I got him to the ground.
And yes more avoidance help a lot.
Also I found out that using my rocket boots can help to avoid 1-2 hits of the blade.
The rest of the firelands was trivial.
I think I will try to make my first LK 25er hc kill next (never try it with lower gear, but I think now the fight is also trivial).