I got the solid rear nylon mount from LoCo as well for the P11. I only did the one rear mount and used prothane in the front with stock on the sides. I think this is a nice compromise with the vibrations. I upped my idle to 925RPM and I really don't have much issue with vibration after that. I say equivalent to my old B13 with ES mounts all around and steel dog bone mount. The quality is top notch and the fit is perfect. It only took me half an hour to install it and I was ready to go.
I find it funny how people will run the steel dog bone mount all day long on B13/B14, but they won't run one solid nylon mount.
Brent