I found this tutorial and I think I've found the fix for this under sections: 'My texture is Distorted' and 'My texture is Blurry'. I will update this post with whether not the steps work for me or not.
For the 'My texture is Blurry' fix I'm guessing I need to edit the original obj? and then import it back into TSRW?
So I have managed to fix the texture distortion at the base of the column - but the overlays on all 3 are still blurry. I'm yet to fix/find a fix for that yet. Any additional tips on how to improve the quality of the overlay would be much appreciated.