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strange.. I would have though colour correction could be compensated for by re-focusing between filters.. seems not.. most of the time, from what I've seen, you can stop chromatic aberration by re-focusing, as the lack of colour correction in the optics simply makes R G and B come to focus at slightly different points... I would have thought re-focusing throug the filters would negate that issue.. Clearly the Tak image is not showing these halos, where the WO image is, meaning you've narrowed it down as far as to say the WO70ED is the cause, just finding out where the problem is, and how to fix it... You mentioned to me that CCDinspector says its slightly out of collimation.. Maybe try to do something about that? I don't know what you could do, considering the lens cell is not adjustable. Maybe shim the focuser to square it up but even that won't help if the lens spacings and matings are sub-par..
Quite the conundrum...
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