The space is way too small for that many plants. not enough lights either. You will never get close to the full potential out of what you have.

Bigger cab, more lights.... Use several 23w CFLs, split them between 2800K and 6300K so you have full spectrum for the entire grow cycle. A 4 inch muffin fan is not near enough.. the cab temp should be around 80F. Definately transplant, and for future reference, top the plants at the 3rd or 4th node, and in turn top the branches at the 3 node also. 18/6 on lighting for veg, then 12/12 for flower. MG potting soil (non moisture control) works very well, but can be a bit strong on the ferts for very young sprouts and seedlings. I attached some pics to show you the difference. BTW, I can't grow more than 3 plants at a time even though my cab is an 8ft tall, 6ft triangle. Most of the strains I grow are 4 months from seed to harvest.