i really like how it works for archers now: the skillbook that gives 30% instead of 10% feel a lot less grindy to get a good % of proc and identify archers' s role as aoe-guys
i d just suggest to put a bonus to stats depending on class:
some hp boost for warriors (like 20% more is enough)
an heal that scales with healer hp (lvl 1 healer has 100 hp and heal replanish 20% -20- to anyone healed. lvl 20 has 500hp and replanish 25%hp -125hp-
a bonus dmg to archers (+1 every 4 lvls, which is a 20% bonus)
also, i would get +10%hp wars and -5% mages and archers to stress their tank role.
swiftness skillbook helps make wars the frontline, so, well done with that, it s a new and intelligent way of defining "aggro"
at high levels archers can solo any pack of mobs with enought skillbooks: i would suggest that they stack multiplicatively (first: 30%, secondo 48%, third 63.3% ecc). plus i would lower the off-targets dmg to 50% of initial dmg.
pm me, i d like to help balancing :)