I added the cubes in the first couple minutes, but it was mid-160's. I do have a pack of US-05 that I can try if needed, but I'm interested in what you said about measuring FG. I am using a refractometer, but this is new to me. I was NOT aware that they don't work well for FG and perhaps this could explain why I'm seeing this... these are the first two beers I've used it on. I did calibrate it right before measuring yesterday. Is there a calculator you recommend?