Are you sure that you should have removed 125C and 123C?
Timing issues with 1200 motherboards seems to be a bit of a 'black art', you can't go by your motherboard revision either as they are all a bit 'individual' if you know what I mean.
For anyone having MB issues the first thing I'd recommend is to change your CAPS if they haven't been done already, after that check your power supply and only after you've eliminated those two would I start to investigate timing fixes. You would obviously use a 'clean' install of WB for testing (eg no hacks/patches installed).
I sent my 1200 motherboard to AmigaKit and got them to replace the CAPS and at the same time asked them to test with an ACA card and fix up the timing issues they found. They did a really good job, very happy with the service they offer.