I have a standard bit of advice for any problems regarding reach or finger strength. Go out and get yourself an inexoensive bass guitar. Practice on it a lot. This will improve both your reach and your finger strength as well as strengthening your rhythmic and scalar basics. I say this having been a musician and a studio guitarist who was taught to play by Roy Buchanan and Tommy Tedesco, who was the one who originally told me about using the bass to increase finger strength and reach.

Most people don't know who Tommy was, but you can see here

http://en.wikipedia.org/wiki/Tommy_Tedesco

and here

http://www.youtube.com/watch?v=ae0mMoid5Ts