Gary -
I'll be interested to hear what you think, and see whether it reflects my own observations, or if you come back and say I'm smoking something.

When I said "plays like a GA", I was speaking more to playability than to tone - I'm not sure if it is primarily the lighter string or lower action (or the combination), but the left hand work now requires a LOT less effort than before, and the guitar still sounds good. To my ear, it is very well balanced - a lead line on the high strings does have that echoey (is that a word?) sustain that I associate with Taylors, though maybe not to the degree of a GA. But when strummed hard, or when picking out a melody on the bass strings, there is much more growl and rumble than a GA.
That said, everything is a compromise. It is neither as loud nor as gut rumbling now as it was with mediums and higher action, so who knows - I may try to tweak some more - keep the lighter strings and go with slightly higher action, or put mediums on the current lowered saddle, or who knows what else?
Half the fun of the trip is the journey itself, right?