I have made a 5G batch of IPA and it has been in the primary for two weeks. However, the yeast does not want to settle. When I started to notice it wasn't settling I shook it thinking I didn't aerate it enough and I had a stuck fermentation, I did this twice, about 5 days ago, and then again 2 days ago. I just took a reading and the SG = 1.015. Therefore it seems to be done in the primary. Should I go ahead and transfer it and dry hop it now? And what could be the cause of the yeast not dropping?