Tough to say man, they dont look like nute or micro deffency, although 7.5 is too high a pH, water with 6.0-6.5 water and see if that helps.
Other then that it may be a probalem with too much light too soon or not enough, they look fairly shaded in the shots you posted
Let me ask you a few questions.
- How long have they been outside?
- How much light do the receive and how long do they receive it?
- What kind of day and night temps are you having?