They're too short for their age. That will happen when the light is too close. If a light is too far away, plants will stretch, growing too tall for their age. 1000W is alot for just 4 plants. See about raising the light about a foot or so and keep raising it as they grow if you can. Otherwise you end up with very dense bushes. If that's what you want, then by all means continue. Some of the discoloration on those leaves look more like a genetic problem rather than a nute def. However, that small yellow spotting looks like a deficiency. You want to give ferts that have everything plants need to grow. You want to read the labels and make sure the ferts are complete. Don't give too much however or you create a different set of problems.