The foam HAS BEEN KNOWN to come loose....are you close to an SC? I just prefer them touching my X more than aftermarket folks...
The nearest SC is about 200 miles away hence my reluctance. I did need to use the service for an MCU issue and they were super easy to deal with but it's just kind of a pain by nature of the distance. I agree I would rather have them work on the car than a normal tire shop.
If I remember correctly, higher pressure is how I reduced the vibration on my previous vehicle's snow tires. The max PSI you refer to is most likely the max cold PSI not the max PSI the tire can handle. If they say 51, I wouldn't be too concerned about going to 50 when you're adding air. The foam in the ContiSilents can come loose, but I get the impression the vibration is pretty extreme if it does.
Thanks for the reply. I will get out my compressor and give this a try and do my test loop to see if it makes a difference. The vibration is constant but fairly minor. It just starts to be a real problem after 20 minutes or so my elbow starts going numb a bit. I started using AP more because of this.