Low FGs have been sort my brewing MO. At times, they were too low. I recently upgraded my process because I thought that my fermentation temperatures were too high. I bought a chest cooler and put it in my basement.
My most recent brew, an Irish Red, slightly missed the OG mark (1.068 projected, 1.062 actual) but way undershot the projected FG. Beersmith projected 1.017 and I came out with 1.008. I pitched WLP004 at 64, it went up to 70 for about 36 hours during the peak fermentation, then back down to 60 where it's been for the past week. The beer is delicious. It has the medium-heavy body I was looking for, has the flavor profile I was trying to get, and is spot on with color. Instead of being in the low 6% abv, it's 7.1%.
Is this a real problem? Should I try to find out why? Is 70 too hot for WLP004?