I'd like to get Cryadon some time. 

If you check any Conan-RPG like TSR's or Mongoose's Conan for D&D3 you will notice that Conan usually has levels as fighter, thief and (when we are talking about King Conan) noble. "Barbarian" is rather a mindset or a description of a certain culture and/or tech level.
Even the actual D&D Barbarian from 3.0 upwards and the Pathfinder Barbarian is rather a berserker. Considering this I couldn't see any use for the RM barbarian profession.

That is certainly true.  A barbarian (which used to mean foreigner in Greek), has come to mean warrior.

If you check any Conan-RPG like TSR's or Mongoose's Conan for D&D3 you will notice that Conan usually has levels as fighter, thief and (when we are talking about King Conan) noble. "Barbarian" is rather a mindset or a description of a certain culture and/or tech level.
Even the actual D&D Barbarian from 3.0 upwards and the Pathfinder Barbarian is rather a berserker. Considering this I couldn't see any use for the RM barbarian profession.

The current version GCP-HARP-1000 is probably what you meant by second edition over the 2003 original and revised 2004 ICE-3000 versions. It is mostly rebalanced costs for professions, races, spells, and talents along with clarifications, flat 50DP/level, mandatory sub skills, creature and spell creation harmonized with the bestiary and college of magic rules as well as a few other bits and bobs.
Not sure what you found flat or what would interest you.

Is this the book called "HARP Fantasy?"