My wife's unhappy with the passenger's seat in our 2014 CX-5 GT feeling like she's sliding forward. Visually it looks OK, so it's probably not defective. There's no adjustment of the seat base angle on the manual seat. My local Mazda service does not want to shim the seat mounts because they say it could affect the airbag sensor (I doubt), and they can't order a UK power driver's seat. Any other ideas (other than a cushion)?