I just the bar ends put on my Trek 7.2FX and the pain that I was having went away as long as I keep my hands on the bar ends. But keeping them there meant I was leaning much farther forward and now my lower back hurts. What do you guys think I should do about this? I'm not sure if it's because the handlebars are too far forward and I need a shorter stem, or if it just due to the fact that my core is horribly weak and can't support my weight so far forward. This really puts a damper on my enthusiasm.