Cleric stance will straight swap your INT and MIND. So if you have 100 INT and 60 MIND it will swap the stat so 100 MIND 60 INT. Archaists are not healers, hence the lack of MIND. Most classes are geared toward lvling (so DPS) your job will be where you see the change in stats. SCH will bump up you MIND considerably, swap to another job (say summoner) and your INT will bump up.

It will also no be until you get to end game you will find gear suited for your "job" lower lvl gear is made for lvl and will have stats to reflect that.