Car topping my way

My fishing car is a 4 door Honda Civic for my other Yaks. I installed Yakima Air foils with Yakima Sweet rolls and a Yakima Show boat 66. I am 66 years young and my back is not good. This system cost me a lot of money but I am worth it. I figure since the sweet rolls are there I should be able to load my new Lynx deck up. Has anyone else had experience with this type of system? I eventually want to get H Rails for my Lynx, but I understand they are almost impossible to get. I figure I should cinch strap them under the h rails?

Since this is my full time fishing vehicle I normally leave my yak on the roof with a cable lock through the pedal drive hole with the straps loosened no accessories attached (less to steal) and I use a kayak cover.

Thoughts, concerns?