Is the page up/page down supposed to work on UNP too? It only works on the Smurf SoS. Also, every UNP schlong in the game is permanently erect. I remember when I first installed these mods it was limp when "not in use."
For SexLab animations, you can use the C key for up and Shift+C for down- that way the alignment change should be "remembered" by SL for that animation.
For all SoS-Full animations, PgUp / PgDn work also, but I do not believe that SL captures or retains those adjustments.
I use UUNP and SoS-Full, and my men do not have permanent erections. You should probably post that issue on the SoS page.