Recently popped the lingering sprite priority issue with all games using the nmk16.c driver. This means now it completely 100% works

STG affected
Bio-ship Paladin (+Space Battleship Gomorrah)
Black Heart
Hacha Mecha Fighter
Macross II [Solves lots of problems here]
US AAF Mustang [A big help here too!]
Koutetsu Yousai Strahl
Twin Action
Acrobat Mission
Air Attack
Fire Hawk
Guardian Storm
Gunnail [Big fixes here]
Macross
Rapid Hero [Finally!]
Spectrum 2000
S.S. Mission
Stagger I
Thunder Dragon
Thunder Dragon 2 [Huzzah!!]
Task Force Harrier