>>4116771Your "bright" exposure was 1/125s; f/2.8; 12 800 ISO which is about 3 EV
Your "dark" exposure was 1/1000s; f/2.8; 1600 ISO which is about 9 EV
With your dark exposure as a reference, maybe you could try to lengthen your exposure time by a couple of stops to see where it takes you.