First of all, its nice to see pics of the big day
Ok so scroll FX are triggered when the object is in the center of the screen, now my browser window is longer so this is what I see. My center point has more space above than yours.
If you are viewing on a smaller screen the trigger is going to change. This is the complex part, you want the trigger to change for specific items on specific screen sizes (for you, the descriptive text does not show but for me on my screen size it does). If I change the calculation it will effect all objects for both of us.
A suggestion would be to add the ability to control when the effect starts, this is obviously more complex as it also needs to consider the surrounding elements that have scroll effects and also the screen height.
Im not saying it cant be done, or that I wont work on making it more reliable (I 100% will). Im just highlighting the fact nothing is simple when it comes to making complex tasks/effects easy to us and apply.
I don’t think tweaking the calculation will make much difference for this scenario, what is required is more controls on the scroll FX, leading to more complexity and unfortunately, the requirement of more time and knowledge from the user in order to apply these types of effects.
I’ll see what I can cook up, in the meantime I’ll see if I can tweak the calculation on mobile for a more reliable result.