Refactor jQuery Scroll animation

[Tim Mac]

Hello GSAP fam

I am optimising a Shopify store and need to refactor the scroll animation to JS in order to remove the jQuery dependancy.
I've made an attempt below (sorry in advance)
I don't have a good enough grasp on GSAP to make it function correctly.

See the Pen abYzPdM by mmrrmmaacc (@mmrrmmaacc) on CodePen

(I suggest opening Live View in a new window)

I have overall windowHeight / frame height issues, as its pinning beyond the top of the viewport.

 

I can provide the original jQuery code to refactor.
 

Hourly rate— I'm not sure what to put here but we can discuss.
Flexible on deadline

Thank you