How much leafs should I take off
Based upon your reference picture, I would say all of them.
What are you talking about? Lollipopping? Defoliating? Measured pruning?
Typically Lollipoppers will say to take off fan leaves that are getting no light.
Then there are the defoliators who say at timeframe x and y remove almost all fan leaves
Then there are the naturalists who say never remove a leaf
But basically about a pound, and maybe check your ph, likely overwatering though.