Optimal way to play both Sch and Smn?

[MACEenyo]

I'm not really at this point yet since my acn is only lvl 32, but I've been thinking about putting everything in INT and using cleric stance on SCH. that would still allow me to use swiftcast, surecast and protect. am I missing anything here? any skill I absolutely .must. have that won't allow me to use cleric stance? I've tried asking this in several topics before but people either ignored it or yelled at me, which makes me automatically not take them seriously -.-

Cleric stance reduces healing by 20%.

http://ffxiv.gamerescape.com/wiki/Cleric_Stance