I could certainly use a little insulation on the mash tun, but even if it maintained the mash temp if would still only be at 154 F which is considerably below where I had it at sparging.
I'm thinking of picking up one of those water heater jackets and throwing it around it come mash time and post flame.
I still think I could have brought the overall temperature up a few more degrees and used hotter water as it tended to cool down considerably before the entire 7 gallons was through. Maybe a jacket on the HLT is what I need in conjunction with a little flame below the MLT prior to the sparge?
Nonetheless, I was pleasantly surprised and like Noisy will adjust to my new efficiency by simply brewing bigger and better beers.