I have the exact same set up with the Yakima saddles and rollers and carry two Looksha Sports (17') easily. One thing will annoy you, however. The round stainless skinny tubing makes it hard to firmly anchor your cradle and roller. As you slide your kayak on, the racks tend to flip over. I finally got some thick rubber gasket material and wrapped that around the tubing, then anchored the kayak racks. If I was in charge I would have designed a beefier rack that was flat and not curved. Not in charge...
You also will discover that putting a boat that size onto the rack is not easy. I put the rollers forward and the cradles toward the stern. I haul the kayak over the bow and roll it from bow to stern. Your boat may be too long to pull that off easily. So you will have to climb onto the top of the cabin. Forget the dinky ladder. Just climb on over the forward eyebrow by putting a foot on the forward rail. Then the fun begins. Early in the morning when dew covers the cabin roof, it is slicker than gorilla snot. I solved that problem by putting a dozen stick on traction strips. It really helps. But where lots of cuts and bruises occur is dancing around the razor sharp solar panel. Especially when it is slick.
Good luck. Being able to carry full size kayaks helped sell me on these wonderful boats.
Jeff