I have brewed quite a few batches using wheat lately and I have noticed my efficiency dropping, or rather my O.G.'s coming in 5-8 points below what I had expected. One was a India Pale Weizen, a Hefeweizen and a Wit.
I am looking at one or two possible issues:
The recipes I used were generally imported from BeerSmith and the starting point was the Northern Brewer recipes. I would modify those recipes a bit but I notices that when I import like that, the brew house efficiencies and mash efficiencies do not seem to change when I change the profiles to mine. Again, I just sort of discovered and suspect this as an issue.
I noticed that generally the wheat grain is much smaller “kernals” than barley. I have been weighing out my grain and mixing it all together before crushing in my Barley Crusher. Is it possible that I am not fully crushing the various wheats I have used because of the size and that this means I am not getting the full sugars out of them? In several of the beers, I have around 50% wheat.