4 weeks old and yellow tips on leaves (pics)

I just transplanted from a soil-less mix in solo cups into a top drip hydroton system. I moved from a GH 3 part 50% veg mix to a FULL strength veg mix. I also think I got some nutes on the leaves from the rings splashing and that caused a burn out, but I cut the tube housing to help the rings sit lower. I know perhaps, over watering (because I was told not to turn off this system and let it run 24/7) could be a cause as well as the stress. but its been over 48 hours and they still look sad with the now additional yellow spots on leaf tips.

ANY help would be great....ask me all the questions you have too.