I have a 2020 Mercury Pro XS 175. I was running down the lake this weekend at ~45 mph. I trimmed up slightly and all of the sudden I lost rpm's and the motor started to vibrate. I thought something was wrong with the motor. I put it in neutral and revved it up and it's as smooth as butter. I'm in FL and the lake I was on has zero things to hit in the lake. I looked at my prop- no signs of damage. We had to idle all the way back to the dock as the vibration was bad. Any ideas???