Was the Trek 1500 fitted with Shimano, or Campagnolo? I'm 5'4" and Campy are way too big for me. I've been comfortable with Shimano, and the 105s are a bit smaller than the 600s--but rarely do I ever ride in the drops, mostly top of the bar or the hoods--if you do, consider aero bars instead?... so not sure if there's anything else to help you as there's just not much to be done about the distance between the bar and the lever... frame size is irrelevant. Though I thought I've seen a bar from Terry or someplace with a special bend in it to reduce the distance between the drop to the shifter. Good luck hunting!