Cherry Head by Pure Sunfarms

I've been out of town for the last 10 days and had a friend looking after my plants so no pics since the early seedling stage. For the last two weeks they have only had water, no food or nutrients. The dome lid has been on the whole time with humidity in the 85-90% range and temp around 21 C. Just got back and see the plants are looking a bit rough, especially the top leaves which are curling up. I'm thinking it could be a lack of nutrients and/or a heat/moisture issue. Transplanted to solo cups and moved the light up a bit higher (it was about 4" off the top of the plants, now its 7"-8" above them). Added some Cal Mag, Great White and Clonex to tap water. The PPM of the water (before nuts) was 54, and afterwards its at 1100. I realize thats super high, but I followed the dosing recommendations. Is this normal? The PH is around 6.8. I've also removed the dome lid to allow better air flow and reduce humidity. Its currently about 19 C and 65% RH. Update** Thanks for the help everyone, I've moved the lights further away and that seems to be helping. Half way through the week, decided to set up the grow tent. I have my 1,000 W light set at 25% (250 W) and its about 30" above the plants. I've also set up a small fan to blow just above the leaves for some movement. Temp is still around 20 C and 60% RH. The plants seem to be growing as you can see from the pics, and the new growth doesn't look as damaged so hopefully the changes I've made are resolving the issues. Open to any suggestions :)