ALU 16L had much more power. The ball really popped of the racket. The 4G 16L had a more muted feel and did not have the extra spin. I am very interested to see if the 4G 15 will make a difference.
I'm sure its been discussed but I always wondered why ALU does not come in a 130 or higher gauge. This would really be the perfect string for this racket.
Solinco Tour Bite may be the answer but I usually do not like "shapped" string as I find it less control for some reason and sometimes balls fly of in a different direction.