Hey Mate, just like Fusion said, lower your PH to 6.3/6.4!
Lower the temp in your closet, 33°C is way too hot and depending on that and thr RH your VPD is also not good.
(Vapor pressure deficite) That's the Relation between Temp. Humidity and pressure inside and outside the leaves. You may get some Infos about it.
For example my 3 week old have the following setup:
RH: 65-75%
Temp.: 27°C Max
Soil: less nutes, Moist but not wet.
Hope this help a bit.
Cheerz, OimRausch