I brewed a Rochefort clone last weekend, came in low on my gravity at 1.068. Took a gravity sample earlier today, which came in at 1.024. It's been fermenting for 7 days so far, at 19c/66f. I've never used this yeast before (use WLP530 on my previous attempt at a Rochefort), so was wondering whether this is normal and I should just leave it going, or should I attempt to rouse it and maybe boost the temperature a little.