Issue: Roblox uses Cubic texture interpolation so textures getting blured and unwanted texture parts are getting on the object’s UV. Issue sometimes might be not seen on close range but on far distance.
Fix: Fill the space near the UV seams like shown on the image below. It will fix issues I mentioned earlier.
perhaps a bit more? as much as possible actually. There seems to be no black on the model, have you tried filling in the entire thing (even the blank spaces) with color?