The past decade(2006-2015):
Louisa - 65 wins, 42 losses, 60.7% winning percentage
Sherando - 91 wins, 26 losses, 77.7% winning percentage
Salem - 104 wins, 19 losses, 84.5% winning percentage
Louisa - 2 undefeated regular seasons, 3 sub-.500 regular seasons, 4-6 playoff record(1 playoff win from 2007-2015)
Sherando - 2 undefeated regular seasons, 0 sub-.500 regular seasons, 8-8 playoff record
Salem - 6 undefeated regular seasons, 0 sub-.500 regular seasons, 15-9 playoff record
Louisa - 3008 PF, 2391 PA(28-22 average per game)
Sherando - 3393 PF, 1646 PA(29-14 average per game)
Salem - 3835 PF, 1699 PA(31-13 average per game)
By no formative stretch is it fair to say Louisa has done just as much as either of those schools. I could probably dig out a host of other stats to further bury that point but I think those do enough. Salem and Sherando share more regular season and playoff success and they overall defeat their opponents in a more sound fashion.
I bear no ill will towards Louisa and their strides as a program in the past decade are clear and apparent but there is a definite line in the sand between their program and the two you mentioned.