ok without pics i can only speculate as to what's wrong but i will give it a shot. first of all, when a leaf is damaged there is really no need to cut it off- once the plant has gotten all the nutes it wants out of it, it will kill it off itself. As for the purpling, it's a nute issue. What nute problem it is, depends on the specifics of the purpling. Is it the leaf stem (petiole), the veins of the leaf, the stem of the plant, or the entire leaf? You can check out a plant problem guide like International Cannagraphic Magazine Forums - The Complete guide to Sick Plants,pH, and Pest troubles! to scroll through to see pics that match yours, or you can search 'purple' in the forum to find threads like yours (there are lots). Lastly, the krinkling is likely due to either overwatering, or heat stress.

Like I said, pics would clear things up a lot but for now I hope my info helped!