Listen to Spatts on this one my friend, I went through the very same thing many years ago. Switched to a more narrow grip, and continued to bench heavy...It really helped for awhile, but then the pain came back...slowly, but it got worse as the weeks went by...THEN I made the biggest mistake I could have made....Rather than taking time to let my shoulder heal, I went another routs...Cortizone....That done me in....I kept hitting it hard for powerlifting comps I was invloved in....A year later...I finally had to have my right shoulder completely repaired.....The pain was like nothing I have ever felt in my life....
Think about it...to get to the rotator cuff, they have to get by all three heads of the delts....Rehab lasted well over a year, and when I got back into the gym, I couldn't even bench the bar....did alot of pool therapy, and light dumbell work(Which I recommend for you right now)
To finish, I ruined my chances of ever hitting the bench hard again, my movements are very limited, and I tend to use hammer strength machines for bench, and smith machine for squats due to lack of mobility....
Live and learn, but listen, take time off, good anti-inflamatories(sp), and let it heal naturally....otherwise, you'll end up with a nice scar that runs from the top on the delt, to the bottom of the armpit like mine....E2, El Cubano and others had the same thing as I did, reaction, the very same...we all made those mistakes babe...
Good luck,
Ranger