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I've wondered about using a large reflector (white muslin/vinyl/sheet) to kick that warm backlighting for warm fill to help with both the exposure and to offset the color of the cool skylight. I haven't shot people in forever, much less groups. so this is only conjecture on my part at how effective it might be @ kickin' the backlighting.
I don't have any large reflector panels at the moment, but I've used them in the past and they can be pretty effective. In addition to white fabric, I've used both silver and gold metallic, and all have their place. The Lastolite twist-to-fold kind and models from California Sunbounce are on my short list of products for next spring. One problem with them, especially the metallics, is that they can cause the subjects to squint in bright conditions, but it's not a deal killer.