Can i remove more leafs later in flower?

you should be removing leaves every few days, mostly the largest ones facing inwards, you only need to have a few fan leaves on each main stem, airflow and light penetration are very important for a higher yeild of hard nugs, the bottom needs light

You can but I would really be selective and do just a couple here or there. Doing a bunch at once might be a bit adverse. You just wanna avoid sending the plant into a shock. I dont think a few leaves here and there would be very harmful.