i noticed change as you described when flying full or 1/4 fuel.  i carry 30 
gal ,from the main spar to the rear spar tank config.  when light on fuel, it 
takes a little nose up trim,with full fuel, it takes a little nose down trim    
lite on fuel,it's more stable than full fuel,that seems to be  kinda like 
balancing on a ball.  :-)  steve jones  n212kr

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