Passion1,

Try converting the rails first - what do you get?

What is the output impedance of your transducer? Can't suggest a cap for RA3 until this is known.

For VDD and VSS, try a 10uF electrolytic and a .1uF ceramic (in parallel) - but adding these blindly is not your solution - what are you using for a power supply? I cannot believe this (lack of these caps) is your problem if you get 95 or 110 out now.

What else is going on in the circuit?