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 PS (2014) 90 - Wilson Pro Overgrip - 13 ounces
Wilson Gut 16 / Luxilon ALU Power Rough 16L 50/48 pounds