Number on tip is to start use micro nutrients. By using micro nutrients in pre fermentation the yeast cells grow to be extremely strong and healthy. There fore, the yeast perform better in fermentor, giving a better fermentation that complete to dryness. On top of this, it often happen that one get 0.2-0.8% stronger mash because yeast is strong enough to ferment to lower dryness.

What ever your problem are, send a mail. Even if no other supplier have fixed the problem, this is not unusual.

Kindest regards...
      Gert Strand