The Swan Yamaha rider had already extended his lead atop the overall standings with victory in race one but he wasn’t about to stop there, repeating the trick in the second too.
Hill, the reigning champion, is now sitting pretty at the top on 316 points, 40 more than his closest rival Josh Brookes, after the Australian claimed second place with another typical late surge, with just two races to go before the Showdown.
Completing the podium was Michael Laverty in third, the Samsung Honda rider having led for the first half of the race.
“There was nothing easy about these wins. This is a very hard, physical circuit to ride and that has taken its toll; it certainly wasn’t easy for me out there,” said Hill.
"I couldn't have asked for me today; two wins was the plan and we leave here with another six podium credits so it was a great result.
"I pushed hard again as you can't afford to give an inch such is the level of the competition."
Not only did Hill claim the win in race one but with it he secured pole position after clocking the fastest lap.
However it was Laverty that got the best start, storming to the front despite starting the race in sixth on the second row of the grid.
MSS Bathams Kawasaki rider Danny Buchan enjoyed a superb British Superbike debut in race one as he finished fourth, but in race two he could only last two laps as he suffered an early exit.
At the front the leading group of Laverty, Hill, Alex Lowes and Josh Brookes began to break away from the rest of pack and started to duke it out for the podium places.
First to make his move was Hill as he went into the lead half-way through the race, a spot he occupied all the way to the chequered flag.
And despite leading for the first half things went from bad for worse for Laverty as he was bumped down into third by Brookes with just three laps remaining, the Australian having got past Lowes a few laps earlier.
Race two results:
1. Tommy Hill (Swan Yamaha)
2. Josh Brookes (Tyco Suzuki) +2.161s
3. Michael Laverty (Samsung Honda) +2.594s
4. Alex Lowes (WFR Honda) +2.730s
5. Tommy Bridewell (Supersonic BMW) +12.591s
6. James Westmoreland (WFR Honda) +17.425s
7. Ian Lowry (Padgetts Honda) +17.771s
8. Peter Hickman (Buildbase BMW) +17.850s
9. Karl Harris (Quattro Plant Kawasaki) +21.724s
10. Michael Rutter (MSS Bathams Kawasaki) +22.100s