Lab summer school in middle school is not really academic, it's more arts focused. I feel you on the difficulty of summer programming... we considered ASDEC's middle school program, but it is far from us & only went 9:30 to 11:30 or noon.
Our daughter did Lab summer school two summers, and by the last year of lower school program, felt the reading instruction was below where she was... and she was testing a little below 25 percentile on MAP type tests.
Siena Virginia campus, Oakwood and Linda Mood Bell (sp?) are all possibly closer to you?