TCK, I would invest in a good soil pH probe. you can find them at lowes for around $10 or $15 for a very basic soil ph meter. It is VERY common for a lot of growing mediums to have pH of 7 to 7.5. I am very curious to see what your soil pH is. above 7 could be causing micronutrient deficiencies such as iron and zinc. The yellowing in between the veins on the younger leaves at the top certainly looks like zinc deficiency but I think that the pH may be causing that. Not sure about the clawing leaves yet. Genetics could be partly to blame for that. We need to know what the pH of the soil is before anything else. Have you considered foliar feeding with a very dilute solution of Micro? Lets see what the pH is first though.