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MSFS Normal Map introduces excessive gloss

Good day folks, I have a bit of a mystery on my hands I was wondering if someone can help me figure it out, and suggest a fix. I've posted the question over on the Gimp general forum, with workflow and result photos here:
New NORMAL Map Causes Excessive Gloss
Essentially, I'm creating new Normal Maps using Gimp 2.10 for a MSFS model. I've redone the rivets and panel lines and the new work looks great, however the new NORM map introduces excessive gloss to the repaint, I can't understand why. Perhaps I'm not rendering/exporting the final texture file in the correct format? I'm just not sure. I am open to any suggestions you have. I am familiar with PBR as I've created several repaints for MSFS including some new NORMAL work using the Nvidia Texture Tools successfully. The GIMP method however has me baffled as I've never seen where the NORM affects seemingly the Green channel of the COMP texture. Any help or an explanation is greatly apprciated.

Shine difference 2.jpeg

Underside shine difference.jpeg
I seem to have solved my own dilemma. I simply used Paint.net to open the NORM.PNG.DDS file and resaved it as BC5 signed, Linear and there is no longer an issue.
Still, I'm curious to know why this solved my issue if anyone can explain. I'd love to know what BC5 Signed, Linear is exactly and how it differs from a raw export out of Gimp where that option is not available, or called something else.