Flowering Clones need help please

So I got these 2 clones(I've been told its some kind of Kush) they were well rooted but small so I vegged them for 3 and a half weeks. They were in great health and were bushy. I flushed them befor flowering(they have been flowering for 9days) still growing but kind of slow. Now the problem I have is all the "newer" and younger leaves have lost colour and turned a very lime green, they don't look healthy. It can't be a nitrogen deficiency cause I tried giving it some. I'm thinking it could be a sulphur deficiency cause the symptoms are similar too a nitrogen one. I've given it my flowering solution whitch has sulphur but I haven't noticed a change. I'll try and get some pics up soon. If anyone could help I'd appreciate it, thanks!

I'm using PRO-Mix(mostly peat moss, compost, perlite, and some dolomite lime) 400watt MH for veg and a sodium for flower is what I'm using now. 2part veg formula and 2part flower formula with monster bloom I haven't used yet. I've been using some root excelorator too