Cause or effect? VPIP sliding

[NateDog]

Over the past month or so (10K hands) my vpip has been steadily decreasing, from 19 to 16. PFR has remained at about 10. Am I passing up on too many equity edges?

When I first started reading the boards about a year ago, the 'norm' was about where I am now. Now most of you guys are in the 20+/12+ range. Is my learning curve that much slower, or am I looking for larger edges to push, and foregoing the marginal ones?

I'm still in the 11/12 PFR range from MP2 and later, but 6's and 7's up front. Natural evolution, or weak-tightness?