Thanks for your replies man.
These listed on the after bake error list are the only ones that are not fixable no matter what. as you can see some are below 8% and the rest are stuck at 50%~.
The rug picture is showing one of the UVs, channel 0 (the messy one) and chanel 2 (the generated one for lightmaps) and this is the one with 48% overlap .