RAF processing with PaintShop Pro X15

That's impossible. Lifting shadows means compressing in the upper range and expanding in the lower one (r-shaped curve). Silkypix has contrast center adjustment and manual curve control, that both do just that. Saturated highlights are difficult because they lost information and have to be approximated/guessed, but in shadows all you have to care about is noise -- please don't tell me that Fujifilm has a noise problem in shadows, even trolls will laugh at you.