I approach available light photography with a color meter and a full set of CC filters. I match the color output from a small strobe unit to the color temperature of the ambient light, then "program" a gentle fill ratio. The results are much more than you might expect from an available light approach.
35mm Portra 160
35-105mm Lens
1 2 3 4 5 6 7
Flash fill from
right side.
Available Lt.