I've made a couple of changes to my equipment and process in the last couple of brews, and I think I'm now going crazy.
I used to use a corona style mill for my grain. Now I use a barley crusher. That's the first change.
I've made changes to my mashing procedure. I used to sparge with water that was 168F, not bring the grain bed to 168F. Now I raise the grain bed to 168F and let it rest for 10 minutes before draining. I do this a second time with the remainder of my sparge water. The grain bed does not exceed 170F.
Here's what I'm not sure of. I used to get somewhere around 70% mash eff according to BeerSmith. My last brew was 97%, and this one was 95%. Am I going a bit crazy, or is hitting those numbers par for the course for you guys? This means that my brewhouse efficiency works out to around 90% or so.