After a week of fermentation at a consistent 70 degrees (surrounded by water) I only got 60% attenuation using WLP001. My gravity is 1.029 and should be around 1.015ish. My OG was 1.073. I pitched a liter starter, but while I was brewing on a hot day my starter got up to about 85-90 degrees before I pitched it into my 72 degree wort. Could that be a problem or should I just try heating up my fermenter to 75 or so? Any suggestions?