Close enough I'd say.... hmmm...
I guess double check cap values in signal path, particularly the low side C5 and C8, double check that polarity on C6 and C7 is correct.
I'm wondering, since C6 and C7 are electrolytics, if the could be a bit leaky and cause that. Maybe replace those two with tantalums in 2u2? Bit of a shot in the dark, Chuck would be the better person to make such a call.