I've run 25/10 on my 22 and I still use it in slick conditions as a tuning aid.
From what I understand, you're right to be trying to separate the kick from the caster as 20/10 or 25/5 or 30/0 will all behave subtly different.
Increasing the kick angle will exaggerate wheelbase change during compression. Again, from what I understand, increasing kick will also enable greater weight transfer - but it will resist any initial transfer longer.
So in theory, 20 deg kick will produce the least amount of weight transfer but it will initiate the transfer earlier.
It's always worth re-visiting geometry choices and objectively testing them back to back to decide if the original decision is still the best one. Our setups always evolve. As Delves has said, he likes the 4mm trailing and that is certainly an effective mechanism to reduce the front end aggression. Personally, i can't get on with the 4mm myself so I continue with the 2mm.
But its also true to say that since everything affects everything else, simply changing one aspect may not always yield the best result and can give a false impression. You may need to alter other aspects of the set up to yield an overall improvement and failure to do this will otherwise lead you to thinking that the single change was not worthwhile.
HTH
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