Forestry bog earth/peat

Hellow again, everypony!
I tried to make a peat-farming program for turtle, and I used a compare function to tel, whether peat has grown or not. And there are a problem: it seems like bog earth has some number of growth stages, indistinguishable between each other… So, turtle.compareDown() starts to return false for bog earth, which hasn't grew yet, and that breaks the whole idea, since it resets that piece of bog earth to the very first stage, and thus slowing down peat production. Is there are any way to fix that issue, or I should just use a Peat Bog and a Turbary?

Just use what forestry gives you, then have the turtle suck it up from the turbary. Or use the Aperture Science Turtles mod with their database. Or cheat and get a completed bog earth block to compare to. Silk Touch will grab it I think.

Yeah, I should make a peat farm maintainance program instead… And I don't like buildcraft pipes, so… turtles could help :3