I was wondering how you knew your loop temperature. I was unaware the Meg had a thermistor in it's loop, that is REALLY cool. I need to have a talk with Martin Parker, now, lol.

The issue with adding insulation to a Meg scrubber is you are adding buoyancy.

I wonder if spray coating it with a light density thermo-nylon would do the trick. Or that spray on bedliner material. I know it may increase scrubber efficiency.