On one of my newer ABs I got clementia last even after high heal.
Praef 1 - just so good for keeping people alive and healthy
Coluseo 3 - similar to praef for keeping HP high
Canto 3 - MUST HAVE for me ASAP, it keeps parties walking much faster = finishing faster. Windwalker is too slow for my taste. I can't believe people will opt for sacrament before getting canto just to be flashy.
High Heal - great for burst heal amount, even greater when 110+ and can use the light of cure
That leaves clementia last. Yes it does give STR, VIT, DEX. But rangers are one shotting everything easily in mid TI without any buffs already anyway. Yes the DEX and INT will help cast time but it's not nearly as important as having praef up, having everyone agi-ed up, and so on. If you are good at remembering names (very important for ABs at least later on), you can remember the people who need bless most. This would be yourself for higher INT for heals / sp regen, DEX for slightly faster cast time. Warlocks and Sorcerers benefit a lot from 10 INT and 10 DEX. Genetics need the INT a lot and the STR / DEX is nice too, but not all genetics are equally useful in mid TI you may find.
One thing that nullifies all of the above however is popping a BM on the eden 91-99 boards. That alone should give an AB more than enough job levels for all of the basic skills.