I suggest the new Head Lynx EDGE 17g. It has the same 7 sides like Black Widow, but it is slightly firmer, (but not as firm as regular cyclone), is a little more powerful, more durable, and slipperier than the Black widow. Spin is better IMO than Black Widow because the Head string is slipperier and snaps back more. Control is better IMO because the edges don't round off as fast as Black Widow. My son played with the previous PA and now the new PA using Black widow for 2 years. We switched to the Head string 2 months ago and it was a definite improvement! You can tell it's a high quality made string when you look at it and feel it. Strung at 52lbs. Does not cause any arm issues. One of the best shaped polys I've tried.
If you want softer, Volkl V-torque Tour in 17g or 18g. This is another phenomenal string. Lots of power, control, and spin. Volkl cyclone tends to be too plastic feeling for me and a little too firm. Volk V-TORQUE tour can be strung a little higher.