What makes you think a shorter stem would be good?
General rule of thumb says that in a relaxed position you should be able to look down at the front axle bolts\qr and the stem clamp will be in line with it. If the stem\handlebar clamp is in front of the bolts then perhaps you are right, but a 60\70mm stem is pretty short and will no doubt quicken the steering up a bit...perhaps too much.
Alternatively, your seat maybe too far back?
I felt too stretched out on mine, despite having the seat forward. I got a 20mm shorter stem but ended up moving the seat back 15mm and now it feels perfect. Small increments make a big difference...