Accurate bench shooting is a function of many things being "right". The technique & rifle-rests are just as critical as the rifle/ammo itself, not to mention that a low power scope won't get you consistent tiny groups either.
Since you are getting great accuracy out of 2 of your 3 rifles you are doing things "right".
A 168gr match bullet should really perform in '06 with 1-10" twist at 100yds so concentrate around that weight. Since you have tried other combinations in the .30-06 without much improvement, I'd be looking at possible problems with the gun/scope itself. Check all the usual suspects like bedding, action screw tension & scope mount.
JIMHO...
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