fl studio 20

Hello guys i have experienced some very big problem with my OBS. Whenever i start Recording FL-Studio i keep getting lags and audio crackling even though my FL Studio is running on 20-25% CPU Usage and OBS is running 8-10% CPU Usage. I really tried everything i knew(Lowering FPS & Quality...

OBS is recording all the sound off my desktop except for the one coming out of fl studio 20 (mac). I know that for windows you are supposed to chose ASIO or smth like that but mac doesnt have that option. I want to record production videos and I need to be able to record audio from fl to do so...