Dan, sorry to hear that but I did mention that you would have to "invest" quite a bit of money to get a meaningful improvement in performance... I guess in this case the $3800 isn't quite enough although it is a decent sum of money no matter how you look at it.
I'll send you my EAR324P to play around with if the XP-15 does not improve after a brief break in over some days. I'd like to hear your take on the 324P, a SS phono stage with step up trannies for MC side of the equation. I personally think it is an absolutely smoking phono stage as far as SS goes.