I have had my first batch of brew fermenting for 13 days. There is still a krausen foam layer on top. very little activity in the air lock (it bubbles every minute or two). the gravity has been reading 1.023 for the last 3 days. the target final gravity is supposed to be 1.012. (original gravity was 1.052). should i go ahead with bottling, or do i need to do something else to try to get some more activity.