Are my leaves getting burned?

Hey man, just from looking at this picture and the other pictures from your diary, that's as healthy as the leaf can look in my eyes. I also don't really understand what you mean by bottom? The point where the leaf-fingers connect is called rachis as far as I know (Just dropping some nerdy knowledge here, please don't kill me if I'm wrong :D) But in all honesty, the plants look extremely happy man, don't worry too much. Oh and btw, like @FREE_HONGKONG mentioned, definitely top them, it'll work wonders. BTW I know from past experience that the older the leaves get, the more of a "papery" and fairly rough feel they get. Thats apparently completely normal ;) Love and peace :)