A lot of my clones grow three fingered leaves for a couple weeks after they root. I think its just a stress thing, possibly related to your heat wave or something else.

I used to use Liquid Karma but have just been using regular nutes only for the past two grows and haven't noticed a difference. Its just supposed to break down the nutes so the plant can ingest them easier according to my hydro guy. And I only used it in flower.