Cautionary tale: Last year, when I set up a bike I'd just built up, I set the saddle too far back by quite a bit by 1) writing down a measurement wrong, and 2) the saddle creeping in the clamp on the seatpost. I started having some pain in my hip, but I tried to ride through it, AND I was ramping up my mileage quite a bit - like a sudden increase of 30% or more. I ended up in excruciating pain, and ultimately I appear to have done damage to my L4 nerve, so now I have a numb patch on the inside of my right knee. So, my advice is not to ignore it.