I have somewhat the same bumper combo that you are thinking of adding and I think you could go with what you have. I would expect a half inch drop or so from 600 pound springs with bumper, lightbar, and winch. You could always save a little weight by using synthetic line instead of steel line in the winch which would help slightly.I’ve got ultimate 3 inch lift kit from Toytec Bilstein 5100 front adjustable shocks with 600lb coil spring