Have you tried switching around your thermometers? the ones in the picture can be 4-6 degrees apart from each other and still be working according to their specs... try flipping them and if you get consistant readings then you might consider bumping up your fan. I've been messing around with the NoiseBlocker-Blacknoise Silent Pro 140mm PK3 fans. they produce about 90 cfm @ full speed.
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