So, if I understand this correctly, the 2947 clutch would cool better in city driving due to the higher percentage of engagement? I'm not concerned with hp loss as much as cooling efficiency. Also, I am uncertain about the number of blades on the fan. From what I've read here and elsewhere, some say the 5 blade is best while other say the 7 blade is better. I'm uncertain which combo to go with, 2965 or 2947 clutch with 5 or 7 blade fan.