Where did you get your filters? I've been getting mine at lowes, you can find two filters that look the same, length etc, but noticed some have only a small hole at either end and others have a large openings. You didn't by chance pick some up with the small opening? Was half way out of store when I looked down and saw only a small hole and went back to get the other ones.
2011: 54 days, 2012: 218 days, 2013: 175 days, 2014: 196 days
2015: 188 days, 2016: 72 days,
2009 Berkshire, 390QS, and toad