On brewday, I discovered I had a few extra pounds of Weyermann Pils left. So, I ended up doing a 50/50 blend of Weyermann and Best Malz for the Helles. The numbers were exactly the same as a 100% Weyermann pils Helles. Even though I didn't use the Best exclusively, it seems that whatever extract difference exists between the two malts is pretty negligible.