You can hit spin with E. I use something between an E and a SW - you may want to try this. Basically, grab an E grip and shift your palm down just a bit toward SW. I find topspin easier with this grip than an E and it is still a pretty good grip for low balls. I don't like a SW for low balls.
For spin, this might help:
1. move the hand to contact and try to touch the lower outside of the ball.
2. pull the hand thru contact and accelerate the racket. You must speed up thru the contact zone to generate spin.
3. racket path should go from lower right to upper left
4. racket face should be slightly closed or near vertical but not open