Re: Substrate in drainage layer
My advice - redo. Yeah, sure, that would be a pain in the ass. Go ahead and let it hurt. You won't forget it as fast, if it hurts some. The sooner you get it done, the sooner you're living in an improved reality. Don't put it off.
On the redo, do it better than you did the first time. I.e., don't re-create the same system for removing water. You've already gotten good advice on that, I don't need to repeat it.