Try to adjust this will get u different result ~  currently Max I get is around 12 - 16 G~  unstable ~

1st - #define MAX_WORK_COUNT      8  // must be binary multiple and match driver

2nd - #define TICK_TOTAL          12355  // 2^18 / 21.33uS TMR0 period (adjusted down for push time)

3rd - #define DEFAULT_HASHCLOCK   2300

this are the combo ~ u need to try on vary no. ~ if u get a best Combo ~ pls suggest here too