why do need such a vast amount of 5v regulated current ?
led strips and other hungry things can be run from pre-regulated power ie 12v at much lower current for the same power.
things like the pots that need very little current but zero ripple can run from a ldo 3.3v reg , that reg can also supply vref to pic adc
design of high freq smps pcbs , especially ones that are efficient and don't get hot and cook themselves is a big rabbit hole to go down.
chinesium supplies are much cheaper but specs are always sketchy, and long term resupply is never guaranteed.