You're doing fine haha, I've got a monster mother and thats about what I'm doing right now. Very minimal on the nutes. The great thing about a mother is that you've really got time to let her show you what she needs, I'd continue the way you're going until you happen to notice that maybe it needs more or less nutes, though I'm doubting more is required. When I take a bunch of clones off of her I poke a rod into the soil around the outsides of the container to loosen up some soil and allow for fresh roots.

What size container do you have and how old is your mother?