Jessica, 
I think that if the grand piano is unstable after being moved, supposing the climate is the same in both locations,  it is because of the vibration caused by rolling it over that old, less than perfectly smooth church floor.  I have yet to see a piano equipped with shock absorbers in the legs.  A piano truck helps though.
<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /> 
Respectfully, 
 
Chris Rawson, 
 
www.key-leveling.com
