Wrinkled leaves is a sign that the soil pH may be too high. You have to check and possibly fix that. Also, you can foliar feed at any time.

Re-vegging is a GREAT time to give your plants SuperThrive. I like to leave ming under 24/0 VERY blue flourescent light (best success was an Ott Light) and give superthrive at a heavy dose (4 drops per gallon) ONCE early in the re-veg.