the only positive thing u get from lowering is the agressive looks and a little tighter handling.
the downside is tht u cant hit the ride too hard in potholes otherwise ur shock might leak out. and not to forget very fast wear and tear of ur stock suspension.
as u already have big rims , u will have to be extra carefull with ur driving and since u are extra carefull with ur driving , i would say lower the ride