I just transplanted clones into 6" pots from the plastic drinking cups they came in. I suspect my soil mix is garbage. It appears to be 70% wood mulch and 25% sand and 5% pearlite. I plan to re-pot into larger containers and to use Fox Farms potting mix. Should I hold out and wait until plants grow larger and re-pot in larger container, or remove bad soil and re-pot in same small container?