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18000uF is pretty big for these power supplies ... let alone 20000 and 25000.
There is a point of diminishing returns on cap sizes plus when you start getting too big then you run the risk of burning up diodes within rectification circuit due to ripple current.
I would go with whatever the original design called for and stop there.
18000 axials for all and be done with it.
Pay close attention to the little buggers near heat sink. Leaked electrolyte can cause lots of headaches.
Data_East_Cap (resized).jpg
Note that Data East calls out a 0.18F cap for the Simpsons board. OK...off by a factor of 10 on the actual drawing but they were sized at 18000uF.
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