Research "star grounding". There's a couple of good threads on here. As for the ICs, I'd add a 10uF to ground for each rail where you enter the PCB, and 0.1uF at each chip, that should give you a good start. You can leave the 0.1uF across the rails, it'll do no harm. Exact values really need to be sorted with a 'scope, checking for ringing and such like, but I suggest will be a decent start.
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