That's a head-scratcher... It all looks correct to me. The cap/ground joint looks much better too.
My only suggesions are diagnostic not really a fix.
1) I would remove the treble bleed and see if the pot behaviour changes. (maybe the wrong value resistor got put in there and is affecting the taper)
2) completely desolder the volume pot and check the taper with a multimeter. Maybe it is just a junk pot. It does happen, and I've had it happen once (in about 17 years of doing this stuff).
I think CTS Logarithmic pots are around 90/10% split, meaning at the halfway point in rotation, you should read approximately 90% of the total resistance.
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