I have done this twice. Never had a bogey free round though.
17 4's is impressive, 18 would have been other worldly.
I like others had 9 in row once. It was strange as it was at an 11 hole course where you played the 11 holes and then played 3 to 9 again from different tees. My 9 in row came on the back so 10 and 11 were new holes to me then 12 to 18 were being played for the second time.
Regardless of the oddness of the course set up I was well chuffed and still have the card which I do actually look at occasionally. If I had one with 18 4's on it would definitely be framed and hanging up in pride of place.
I should try that. I usually have a couple of doubles that throw it off
Nope. Never done it but would love to just once!