I purchased a set of Radflo coilovers for my 2014 P4X a few months ago but haven't installed them yet. At the time I wasn't planning on getting an aftermarket bumper so I went with the 600lb springs. Now I want to get a steel front bumper and most likely a winch down the road. The Shrock bumper and radiator skid plate weighs around 155lbs. Greg at PRG said he would swap out the springs on them for me for no charge. Which ones should I go with? 650? 700? I'm also running P&P sliders.