The LS1 in my Malibu goes fairly low when idling (say 15-20psi) running 15W40. That said, it runs very high oil pressure at speed (70-80psi). Owner's manual says 4psi minimum hot @ idle, and 18psi minimum hot @ 2000RPM. It's a big of an apples to oranges comparison (Hammerhead is a GEN-1 SBC). But the manual had the same recommendations for pressure for the GEN-1 motors as well.
I'd say as long as your oil pressure is decent at speed, and you have enough oil in, don't worry much about it. In the end, the only real fix would be to pull the motor and replace a bad oil pump at minimum, but probably bad bearings or other BS in the process (which would require a full rebuild). Just run her until she is done...at least GEN-1 SBC's are cheap to rebuild.