Rec Dex Debuff sins are plausible, they aren't my cup of tea but they are plausible
Get EVERY skill with a Debuff attached to it, so the Gruesomes chains etc, skip The evis, agg, tet chain unless u can afford the Skill points to get Evis (for more AoE debuffing)
max Misfortune AND blunt so you can really lower peoples stats.
Link, dex, rec, HP and give it a go. Not sur eon your base stat pool on your toon, but sounds like its low, you'd be ableto get derpimo for 2-3 Op per piece now, so might be worth staying str/dex/luc and farming like crazy (OI, CS, QV, KI etc) then building a dex/rec set.
but regardless you will be a complete support toon and still probably squishy 1200 dex is NOT much in 1-70 these days (I have 1200ish Dex on my Pure STR build), you'd be spamming misfort/blunt and using other AoEs on defenders on priests.
Debuffs pain, slumber, blind, silent, all handy, but as are the likes of curse, panic, jinx for you. Jinx and blunt combined on fighters will give your Warrs a excellent hit rate and more evasion helping them live