Heya MrG hows it going . I would leave the perlite in . It will let the soil dry out much quicker . Unless the soil can dry out every few days it doesnt give you much control . If the mix that you have now is staying too wet then I would not hesitate to transplant into something that will dry out quicker. i prefer to have mine dry out quick enough that I can water twice a week. This gives me an oppertunity to feed or ammend pretty much at will. I believe that if the medium you are using takes too long to dry out then it ties your hands and pretty much sidelines you into just watching. I prefer not too feed through foilage as I try to keep my lights as close as possible and dont want to take the chance of burning leaves. Just thought I would throw my .02 in the mix