David Shoubridge made it a Snetterton double as he beat title rival Tom Tunstall by 5.049sec with another dominant lights-to-flag win from pole position.
Tunstall emerged best of the rest despite dropping to fourth from second on the grid on the opening lap, eventually beating Phil Atkinson by a further 2.498sec.
Atkinson, meanwhile, beat Adon Davie over the line by 0.011sec as Michael Tustin rounded out the top five a further 0.315secs back
Ducati Performance TriOptions Cup, Snetterton, Race Two result:
1. David Shoubridge (Rich Energy Ducati)
2. Tom Tunstall (Motorcycle Race Parts) +5.049s
3. Phil Atkinson (Q-Oil Treatments/Unique Motorsport) +7.547s
4. Adon Davie (JDF Racing) +7.558s
5. Michael Tustin (AH Performance/Breckland Utility Solutions) + 7.873s
Championship positions after Round 12:
1. David Shoubridge 245
2. Tom Tunstall 222
3. Blaze Baker 131
4. Max Lofthouse 124
5. Michael Tustin 109