We have in the past with dd12, but due to the financial need for me to work outside of the home, both girls are in ps right now. Dd10 is the one who I've been trying to figure out a way to keep home for a while b/c she just doesn't thrive in ps and is underachieving. I'm reasonably tied into our local hs network and have been doing some testing and tutoring for some hsers but it isn't enough of a supplement to quit my other job.
This article from the Davidson Institute might have some info you'd find useful based on what you're saying your concerns are. Even when just supplementing, we've usually relied somewhat on online courses that can be done semi-independently. There is, of course, EPGY, but there are also a lot of other online courses aimed at gifted kids. Some other ones are linked
here.
