Terry, You are wise in contemplating your next move. I have one other view point to add to whats been suggested. Are you keeping up with the voicing? If the piano is being played heavily, no doubt the hammers are packing down, and the tone is getting nasty. When you meet with the pianist, evaluate the tone quality. Is it harsh? A little selective voicing will lessen the perception of its being out of tune. One could include light voicing in servicing a performance piano like this, as a part of the normal service call. One way to deflect the acusation of its being your fault, is to communicate to the player that you need their input (voicing preference) before proceeding with voicing. One last note. I find myself asking every client before I start tuning..."Who is the piano player in the home? How long is it played each day? In your situation, without humidity control,there is no way the pianist will be happy, even with twice the number of servicing. Good luck, Dan Reed
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