I've not played anything smaller than 9's and haven't been inclined to go any lighter.
I'm still happy with 10's on all my guitars. Maybe one day my old hands will require something lighter. Also with 10's on 24.75" scale length, they seem to feel like 9's to me. I'd be interested to hear what you think of 7's on a strat.

The whole 7's on a Gibson thing seems to work for Billy Gibbons!