Jackson and Baines could only finish 23rd in the World Cup opener in Lake Placid but dramatically improved to ninth in Utah with a total time of 1:37.68 minutes.
But there was no doubting who the star of the show was again as Holcomb, this time alongside Curtis Tomasevicz and not Steven Langton, recorded back-to-back World Cup victories.
The duo's time of 1:37.40 minutes was just enough to take the victory, 0.03 seconds ahead of compatriots Cory Butner and Charles Berkeley.
And German pair Francesco Friedrich and Gino Gerhardi crashed the American party as they finished third.
There were some surprising results in Park City as German Manuel Machata and Russian Alexander Zubkov could only finish a disappointing joint sixth.
But the British pair of Jackson and Baines will be hoping there is more to come after making a significant leap.