I've been using the 200-600mm zoom with my ILCE-7RM4A for several months for birding and don't appear to have the focusing issue. I would recommend this setup
If there is blue light in the scene -- either from the light source or reflected off of blue surfaces -- like swimming pools -- I don't see how any filter would counteract that. A PL filter can reduce some reflections at certain angles, but that gets rid of surface glare which is usually white -- like sunlight. So you could try a PL, and it might control some of the glare, but it might actually increase the amount of blue light instead of reducing it.
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