Did Breakthrough on skis, but it was too long ago to be all that relevant. My impression back then, FWIW, is that it is very technique centric and geared to just what it claimed: breaking through an intermediate plateau.
Don't think it'd be good for the OP given s/he and friend have already done the JH camp.
The best clinic I ever did was at Sugarbowl -- all mountain ski pros headed by Eric Deslauriers who sometimes posts here. I don't believe he offers them anymore, but this seems to be the progeny of that. Also, Eric teaches for www.skiclinics.com and these clinics would include the same level of coaches and would definitely be able to challenge anyone. (have not posted 2012 schedule yet)
Another plug for the Taos ski week if you can make it later in the year to ensure good coverage for those famous steeps. I believe their format is mornings coaching followed by afternoons on your own, communal dinner and evening talks. The early season clinics are dirt cheap ($99) but go for the $234 for later in the season. www.skitaos.org