Small shot

Who's started out with a small shot of spray (say 35 or 50hp) and what kind of ET reduction did you see with this? Thanks guys.

My friend has a ZEX wet kit with a 125 hp jet that dynoed only 75 hp gain to the wheels and he runs consistent 13.3-4 off the spray and a best of 11.91 on the spray, but consistent 12 flats.

EDIT: 104 mph stock, 116 on spray.