I moved Wendys bars back (Think it was 2" but could have been 1 1/2") she said it helped her back quite a bit. She is only 5'2 though. She does have a bad back and another mod I am going to do that I haven't gotten to yet is a gel insert in her seat. Better shocks help as well. Hard to say if pulling the bars back is your answer since you are so much taller than her. Maybe raise your bars and pull them back like I did. Wendys bike first. then what I did on mine
I learned all I need to know about life by killing smart people and eating their brains. Eat right ,Exercise ,Stay fit, Die Anyway!