Well, I've looked at the pix, checked both my plant physiology and pathology books, and a few university sites, and I can tell you that your plants don't appear to be exhibiting any of the symptoms of any macro- or micro-nutrient deficiency. IMO, you can rule that out. While some nutrient deficiencies do cause leaf curl, there are also other symptoms present at the same time.
As for leaf curl virus, , it does cause upward leaf roll, and stunted growth, but it doesn't progress from the bottom of the plant upward. While it _will_ affect all leaves, it usually begins on new growth, which you said seems to be healthy.
A couple more things to check - look very closely at your leaves (especially the undersides) and check for _any_sign_at_all_ of a purple or yellowish tint, either on the edges or between the veins. Also, feel the leaves of an affected plant, and then a leaf of one of the healthy ones. (It would be a good idea to wash your hands in between, many bacterial and other fungi are spread by contact) With the leaves, you'll be checking to see if the "sick" plant's leaves feel thicker than the healthy one's. While you're checking the leaves, check the stems also. A plant that's just "wilted" (too much or too little water, excessive heat or cold, etc.) will have stems that are flimsy and will flop around. leaf curl virus will cause the stems to be quite stiff.
My first instinct says it's not leaf curl virus,but see what you can find out, let me know, and we can go from there, okay

i will keep searching to see i can find anything else mate have you thought about calcium deficiancy