Curing weakness would be bad as it would create situations where players would stop using strategies and tactics and would just die->get raised->get weakness removed. It would create a scenario where there's no penalty or fear of getting KO'd and DDs could be more careless since their weakness could just be removed. Amnesia is annoying, I'd rather it just be capped at 30second duration or something than let it last longer and just be removable. I think right now WHM's healing/support is very, very effective. As for Damage, they could use another tier of Banish and Banishga IV to make their nukes stronger I suppose, maybe a Repose II, Stoneskin II, Blink II.