I recently bought a 2010 E350 that was converted by Advanced 4WD Systems by the previous owner. It has a 4” lift, leaf spring front with Bilstein 24-065283 shocks, unknown steering stabilizer, 315/70R17 tires (70 psi). The ride is pretty harsh, bottoms out more that is seems like it should, a bit “loose” at highway speeds. Anyone else have a similar setup and experience? Anything different shocks could help with? Does 70 psi seem right? Newbie to all this.