I had the same problem with the TR 55 and 65's
I rang NGK as well and they said the same, gap is to big
Run the bpr6's now as per NGK
I got extractors on mine, there is only a few you can get too with socket wrench but for number 5, i I used
this,! plug that into the socket, then use 1/4 spanner to turn it. 7,8 and 4 put the socket on and turn it with a spanner as mentioned above