Glass Reflection Settings

[HouseFxr]

I've been using Sketchup for over a decade, but this is my first attempt at rendering. Not sure where the best place is to ask questions about Vray - the Chaos forum on their website has very few visitors?

I'm attempting to figure out glass reflections for exterior window glass. Vray 6 and Sketchup Pro 2022. https://drive.google.com/drive/folders/1Mw8aS_ekVUyddx4j7MVMUO6G-V_UnbZh?usp=sharing

I'm trying to determine how to ghost the site reflection onto this model's window surfaces so that the interior can show too. The glass is a 1/8" thick object. The completely obscuring reflection that I'm getting currently starts at a more obtuse reflection angle, so, in the rendering below, one window sash is see-through and next one further away is not. Both of the windows to the left have the same glass - they are both the same components.

I can see that people are creating graduated reflections determined by reflection angles in their renderings, and Justin Geis's YouTube videos seem to make adjusting the amount of reflection simply a matter of changing the Reflection Color and it looks pretty simple, but I have tried all of the settings he uses to adjust reflections and none seem to have an effect on the sky reflection. I would like to know what I'm missing here?

Does anyone know of a more basic, yet completely comprehensive, tutorial on window glass out there? I've watched a bunch of videos and read many tutorials over the last month, and I know I've seen glass reflections covered elsewhere too, but I've failed to understand reflections and window transparency - I just need a step-by-step in-depth coverage tutorial.