On UV issue - well that's curious and something you'd want to resolve. I recommend checking the asset in engine (assuming it's a game asset), alternatively could import into a fresh file. Regarding supporting loops/ bevels: I think once the mesh shades nicely, adding more support loops will do little and mainly increase…
Hm, when I dropped the lowpoly mesh into Blender to inspect the UVs unfortunately look broken: Looking at the lowpoly, I suggest: * Reduce amount of support loops, use as much as needed to get a good mesh shading. Put the saved geometry into the curvature of rounded/ cylindrical parts. The impact on the assets silhouette…