Poor Attenuation On Pilot System

[BanjoPicker]

I recently bought a half barrel system for R and D at my brewpub. I'm having problems getting proper attenuation out of any of the brews. Regardless of my mash schedule, the beers on my pilot system aren't fermenting bellow about 5.5P. I've done forced fermentation tests on fully aerated wort with different yeast strains all with the same results so I do not believe this to be a yeast problem, but rather a problem of sugar profile. I mash in the kettle which is heated with a propane burner. My thought is the thermometer on the kettle must be off, so I did buy an external thermometer to use on the next brew. Anyone have any other thoughts?

I appreciate any help you can offer.

[el_mocoso]

I am having the same problem. It has an external heating element and digital thermometer and I just figured out that the digi therm is off and I have been mashing too hot. I have yet to brew again to find if a lower mash temp fixes the problem. I am also interested in any other ideas anybody has.

el