To summarize: I use the PhotoPhotoRGB colorspace when I convert RAWs to TIFs to retain as much tonal range as possible for as long as possible during the photo enhancement process. Once everything is finished, I convert to sRGB to clip off any remaining out-of-gamut values. This is much better than clipping out-of-gamut values before the photo enhancement process begins, which is what converting from RAW directly to sRGB, does.