There is no dought that you are doing the best with the equipment you have got,and your doing a pretty good job.When you come to flowering you will have some problems with yeild,but a lot can be learnt from these small grows ;ie plant germanation,cloneing,topping sexing and another million i can mention but you are learning all the time.I think you are better of doing a small grow like this so when you do get some hps lights and more powerful equipment you will or should do ok.Back to your grow i would make sure that you buy the best nutes you can canna or advanced,hit them with big bud at week two the pk13/14 3 week before end of the grow.I once produced 2 oz from a t5 four tube light,and was well happy then i got hps and was getting 7/8 oz when i up graded.But now i am gutted at any amount less than 10 oz per plant,thats 4 plants under a set of 2 x 600 hps,last grow i got 42 and 7 g from 4..Make sure that you do not over do it on the amount of plants you do per light this is a sure fire way of gaining less from each plant...tyke