2013 JKU Rubicon manual on 37's 3 1/2 lift. JE Reel 1310 front DS. Re-geared to 4.88 and immediately noticed front DS vibration due to pinion angle. Adjusted caster which helped, but didn't like flighty steering. Removing front DS eliminated vibration. Had driveshaft balanced.--still vibration. Upgraded to PR44 front axle. Really enjoying the extra caster but still having vibration at 65 to 70 mph, but considerably less. Any thoughts? Is this something I just need to learn to deal with?