By using Visual GGPK you can make sure mobs never block you.
Download Visual GGPK ( Blizzhackers ? View topic - GGPK File extractor )
Once you have this open the content.ggpk within your Path of Exile folder and find folder Metadata -> Monsters, once you are in monsters you need to go to each mob and find a file that ends in .ot you will only find this file in the folders of the monsters not the subfolders of the monsters.
Once you have the .ot file double click it to open it in notepad or right click and extract it. Once you do this you need to add this line of code.
Positioned
{
blocking = false
}
Save it and replace the .ot file