But, back to the topic at hand. Making professions stand out doesn't seem to be a problem, they already do. Now, if you are talking about making the professions stand out race-by-race, a human of culture X vs culture Y, and/or dwarf fighter vs. elven fighter, I agree just using the professions and adolescent ranks don't quite do it*. I would delve into the Talents and Flaws system to assist there, and possibly alter some costs/professinoal bonuses.
Maybe do like BD&D did and give each race a "sphere" that they excel in (and others that they don't) and give them access to certain spell lists. Perhaps the spells of the list only work when they are using certain tools (i.e. weapons, armor, specific skill uses in specific environments, etc..).
*Though RM allows you to have different feeling human, fighters much better than most systems, and definitely better than D&D of any incarnation.