Yes, by trimming the ground strap I do mean exposing more of the electrode.
what do you use to index your plugs? I did 2 sets in a row with absolutely NO issue, but this last set I had one of them that I could NOT get to index, at least not with what I had to work with. I ended up using another plug gasket to get it more to where I wanted, but it's still of a good 30*.