You don't have perlite? If your just using soil, with nothing in there to help it drain then that's not good. You could potentially end up with root rot I assume, but am not sure. Make sure you water carefully, and good soil is a necessary investment.
Bloom nutes are good, just make sure your getting the right level of N.P.K, if your not going to a growshop thats important as you could pick up stuff that isn't suitable for flowering cannabis. Another thing you could look into is "Molasses", do a search on here. I've heard it's fantastic for flowering, and can even be used RIGHT untill the end of flowering, whereas nutes shouldn't be.