I've got an imperial stout with OG 1.118 in primary. Its a partial mash with about 40% of fermentables coming from extract/sugar. I added yeast nutrient at the end of the boil. I aerated before pitching, at pitching, and 8 hours post pitching. I pitched 3 rehydrated packets of Nottingham ale yeast, fermented at 64 degrees for the first day, 66 degrees days 2-4, then 68 degrees days 5-7. Now on day 7 I took a SG reading, which was 1.036. 67% attenuation. My goal is 1.028. Should I just let this go another 2 weeks and see what happens or should I try to unstuck it. My thought is to swirl up the yeast into suspension with a sanitized stirrer and increase temperature to 70 or 72 for 2 weeks.