Disklavier

My Disklavier MX1PE (Mark II XG Series) 48" upright is within a week 
or so of its 2-year anniversary.  I've been very satisfied with the 
piano and hope to eventually step up to a Disklavier grand model, 
perhaps the Mark IV.

Since the piano arrived in my home in Dec 2003, I've had the Yamaha 
recommended RPT over 4 or 5 times, including the Yamaha Service Bond 
visit.  Although the RPT tunes the piano and runs the Maintenance 
Mode, he has never performed any voicing work.  Is this normal?  
Perhaps voicing isn't required on such a new piano?
 
To my ear, I find a few notes in the lower end to have a bit 
of "Boing", for lack of a better word.  Also, I find that on a few 
notes, that if held down, have a slight sitar like character that 
kicks in after the initial sound of the hammer hitting the strings 
subsides.  That is, the aftertone seems a bit fuzzy as opposed to 
being completely crisp and clear.  Is this normal?  Perhaps holding 
down a key indefinitely is not a reasonable test?  I've yet to visit 
my dealer to give a few other pianos the same critical listening 
tests.

On a few occasions, I initially though that maybe something was 
slightly loose inside the Disklavier, but after taking the access 
covers off and listening carefully, I've concluded this is not the 
case.

For some reason, overall, I find the piano doesn't sound as good as 
it did in the first year.  I can't explain why I feel this way and 
it may simply be that my initial excitement has subsided somewhat.  
Perhaps I'm only imagining this, or that the piano is now simply 
settling in and taken on a slightly different character.  Then 
again, maybe a different tuner would deliver a different result that 
fits better with my ear?

To appreciate is that I'm very critical and these issues may be nit 
picky.  Also, this is the first acoustic piano I've owned and maybe 
the issues I've brough exist in all acoustic pianos.  However, 
should I consider trying another RPT?

Robert