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I added 2 x 500F paralleled supercapacitors (1.6-7v in each Cap) on each of the 3.3v Vref supplies and I found a very nice improvement in low to mids body and presence in my system. I also added pairs of supercapacitors on the VDD lines but did not hear any change in sound with these in place.
Spent some time sorting Caps to find pairs that charged and discharged evenly and so far so good with balance maintained in pairs. I never shut down power so no worries about startup but I have disconnects in place in case I ever need to shutdown and recharge the Caps on startup.
Will monitor Caps voltages over the coming weeks to see if I need to add balancing resistors.