Re: over reaching
IMHO, it doesn't become "over" reaching until you are getting repeated hyper-extensions of the elbow or you are not moving your feet in and tilting your upper body toward the target.
Sometime shortening up or varying your reach works well because a guy is never really sure where your range is. Also you may have been giving away your intentions with the torso rotation. Maybe add in some torso rotating feints to mask it.
Personally I like to give up a little height to make my opponent forget about range then work with the shorter more compact shots. If I get the better of him and he begins to give me "safe" distance? Tricks on him because now I can fully rotate and STILL reach him.