Tailwind is, somewhat, predictable. At least you can run the calculations with some extra knots and see where it leaves you.
Braking action is harder, you don't know what you gonna get until you try. Not sure about California runways but I remember California freeways being quite slippery after months of accumulated dirt followed by rain.
If the undershoot is flat you can duck under to get extra distance. Not everyone's cup of tea, but if you're close to the margain.....