A capacitor in series isn't going to do anything as the switches run on DC. If its ripple on the line you are concerned about then a small cap (1nf or so) to ground will smooth this out. You can test for this though by putting your DMM to AC.. anything that shows up is ripple.
The Pascal does have 2 settings for the Tilt though.. are you sure you don't have it set to low sensitivity?
