Your plant is heat stressed. The leaf edges of the upper leaves are curling or rolling in. The red coloring of the stems is also an indication of this, but it can also be genetically determined.
The light green coloring could also indicate too high light intensity.
Personally, I would increase the distance of the lamp to the plant to about 50cm. 500W is already quite a power. Additionally, if possible, increase the exhaust in this area and ensure better air circulation. If possible, I would raise the humidity to 60%+. 50% is also okay.
I definitely wouldn't remove any leaves. That stresses the lady a lot, disrupts, and limits photosynthesis. Only the two lowest, thin branches can go; nothing will come from them.