Any chance you can relocate the speakers? When I redid the panel in my ASW15 to install Flarm and an LX8080/V5 I put the vario speaker back in the baggage shelf where the radio speaker was already located (the old Peschges vario had the speaker mounted right on the computer unit behind the panel). The PAI compass was able to be swung to within limits with the old setup but with the vario speaker back in the baggage area it ended up with almost no deviation.