Smooth mouse wheel camera zoom using SpringArm

Does anyone know how to implement this in C++? I’ve managed to reproduce your BP fine, and it works very nicely. However, when I try to recreate this in C++ it doesn’t seem to make it smooth (though it does seem to be interpolating). I’m no expert at either BP or C++ however, and trying to find any resources specifically focused on creating a smooth top-down camera zoom in C++ is challenging to say the least. I would be very grateful for any direction.