I agree with Chris in that PSP's killscreen score is highly suspect for the reasons he mentions. 'Nuf said there...
There is one score on Hank's old list done by a 'David Hansen'. David is local DK player in my town (the only other one), and he and I used to play DK all the time together back when we were progressing in this game towards killscreen-level. Here is the evidence I have for his score, but you can choose to take it or leave it, depending on what criteria for adding scores to this list that we end up settling upon:
1.) I introduced David to the 3-in-1 machine at Dave and Busters around the time when he could consistently get 600-750k games.
2.) He immediately said that DK seemed a lot easier on that machine, since the screen was so much bigger than on a normal cab.
3.) A few weeks later he reported getting a killscreen (891k, I believe it was (?)) on his first game of the day, while playing standing up, at D&B.
4.) Me, having all the records on the machine, rushed over to D&B (I was kinda jealous at the time....looking back, that was stupid of me) to see if this claim was true.
5.) Sure enough, his score was there.
6.) A couple months later he got another KS on that same machine, and it was like 860kish, and that score is there too. There are also several of his other 700K+ scores there as well.
7.) David also always said he was done with DK after he got his first KS, and that seems to be the case. He used to play over and over and be really focused on the game, and get upset easily if he died and would walk out of the arcade angry after a bad session. Now he just plays very rarely, and he doesn't really get upset at all. I've tried to convince him to go for 1m+, but he says that kinda of play just isn't for him. His attitude seems very consistent with him actually having gotten 2 killscreens already.
8.) Lastly, I've seen him get around 750k several times, but he seems to choke on his last man a lot when people are watching, so I imagine he'd play a lot better without onlookers -which would have been the case at D&B.