Hey Toby I'm glad you got things sorted out, I wouldn't be surprised if more owners were to suffer this problem after the wet winter. I was really surprised to see just how good your compression figures are after 207,000 miles as according to Nissan 180 to 195 PSI are really good figures for a strong and the minimum safe figues are142PSI, anything below and you're lookng at a rebuild so wth your lowest figure of160PSI you have a fair way to go before the dreaded rebuild. Again congrats on your fix.