I have used this hybrid before but with 16g VS. I prefer the cross to be 2 pounds less or even 1.5 pounds less than the mains. For me its the trajectory of the ball with my natural strokes that determines the cross tension.
Wilson BLX 90 - Wilson Pro Overgrip - 12.9 ounces
Wilson Gut 16 / Luxilon ALU Power Rough 16L 51/51 pounds