I'm doing my first lager; Octoberfest using WL German Larger Yeast. My starting gravity was 1.50 and I pitched a 2L starter. My expected final gravity is 1.014. It's been in the primary for 1 week at 50-55 degrees and slowly bubbling away all week. I took my first gravity reading today and it was 1.18.
My plan was to keep it in the primary for 10-14 days (depending on the hyrdo readings), then do and D-rest by bringing it up to 65-68 over 2 days, letting it rest 1-2 days, then bring it slowing down to lagering temps. I'll lager it for at least 6 weeks.
It seems fermentaion has gone quicker than I expected. I've read that diacetyl rest should be started when fermentation is about 75% done. Did I miss my window? Should I start D-rest now or am I better off leting the fermentation finish at 50 and take my chances with diacetyl? Will doing a D-rest now do any harm?