Woodnut,
Thanks so much for the TRC.
On a side note, I had a bone nut and a Bob Colosi saddle installed. Not sure if it made much of a difference, it certainly didn't hurt.
I'll be doing a side by side test next to a friend's GSM, exact same model - no mods done to it.
I've experimented with strings and it seems to really like the John Pearse 80/20 in light gauge.
Regards, Steve