Other thread is here >>1114253 on auto-sage, so time for a new one.

I'll start. I think I have a problem with my bike's fit. There are two things:
1) When cycling longer distances I start to get low back pain, and
2) I tend to slide off the front of my saddle.

At this point, I've been riding more than 10 miles a day for commuting purposes for years, and recreational rides, too. I think it's a postural problem. Should I move my handlebars back? Do I need a bike with a shorter top tube?

Additionally, I don't have KOPS, maybe the centreline of my knees is about 0.5" behind the spindle. But I can't move my current saddle any further forward on the seat post.

I could go get a professional fitting done, but it's like $150 round here and I'd rather not if I can figure it out myself. I'm considering buying a real road bike, as mine is a "utility hybrid", so maybe it's time to just get a properly-fitted bike?

Thanks guys.