I recently moved to a 3 vessel two pump single tier HERMS system using a More Beer false bottom/boil kettle screen with 3/32 perforated holes. The issue is: when I draining the mash tun (with a pump), I get really cloudy wort. During the recirculation/heating phase, the wort is quite cloudy too...
I am old school, I use a glass lab thermometer to verify the mash temp. I have also dialed in (adjusted) my bimetal dial thermometers to be most accurate at 145F.
I have relatively new (to me) 3 vessel 15 gallon RIMS setup and I almost exclusively do split batches. Sunday's brew session was 5 1/2 gallons of Bohemian Lager (Wy2124) and 4 1/2 gallons of American Pale Ale (Wy1056). Honestly, if I were you, I would spend the money on upgrading the chiller...