I have three different A5 mags. Out of the A5 oriented, Unoriented A5 and a Ruff cut A5.. I don't know which one to try first in a SH-5. I also have a A8....
The Custom wind is a little bit lighter and snappier than the Alt, it's more sophisticated and harmonic-complex, specially if it's wired '50s style and you use the volume control; it'll clean up nicely, to the point you'll think it's a PAF that suddenly grew a huge pair, have a lot to say with a commanding voice, without being obnoxious.