I noticed that you used a Hps light from day one. The Hps light gives of around 2500K. But for the veg stage you need a light that gives you 6500K, like an Mh or cfls. That may be why your plant grew so slow.
Yeah you should be fine starting the nutes. Just keep it at half strength and see how your plants react to it.
This is a bag seed that I stretched to almost 10 inches before I re-potted it and finally got the right lighting. Stick with it you'll make a few more mistakes before your done. Just...
Day 2 flowering my second plant already has hairs popping out. 2 for 2 females with bag seed. I will post pictures when the hairs are more visible. I also have roots starting to grow from the clones that I cut off the second plant.
This is the second plant that I have grown. I put it into flowering today. A month after the first plant. I think this one looks much better. Now i just have to hope for a female. Trying to go 2 for 2 with bag seed. I also took to clones off and am trying to get those going.
This is day 32. I got the Ph down to six but some of the fan leaves are still turning yellow. With all of the mistakes that I made in the beginning im just stoked to have a female. (from bag seed.)