Well I only play for about a week now but I build it like I would build a warrior, except for the CON. Also reached FC now so restated and I'm happy with the results. STR = I make this the highest. Mine is around 320+ currently (cant check now) ESS = I used about 20-30 points for enough VE WIS = 0 dont use relics that need WIS but if u do just make it for relics CON = think I added 10 just to get a bit more hp for bosses DEX = 3/4 of STR. I would say you could make STR and DEX equal even it should play nicely. I think the STR helps and after I got second roll skills at FC I did tons of more damage. I use that new smash we get which reduce the defense of the mob. Then I kill the mob that's 4 levels above me in 3 hits total. I use +2 VoH gear and +6 axe so not p2w stuffs. Highest hit was 32k crit. Some people says STR is useless now even for Warriors but I beg to differ. Other only build STR but I think a good combination of STR and DEX works well now. just my opinion PS Ido use Premium so have 40+ attribute so my VE is more than enough. Not sure if I have enough VE without it though.
Yeah. You should focus on Dexterity and Strength firstly. Do not add Constitution until you maximize Dex and Str. You take 2 points to increase only 1 points of Cons and it's useless if you add Cons at low lvl. Enjoy playing healer, it's a good role that everyone need in game.