Interesting...what were the other options for that radiator ?
Mine is a 1996 7.4L and it has OEM 3 row aluminum radiator. With a 7 fin ATF in tank radiator (cold tank). Albeit plastic tanks, but they aren't much involved in cooling.
Maybe 'thicker' meant it has more rows, but just a guess, but since you say 'should've opted for 2 row'...says that single row is lower in cooling capacity
Didn't know electric fans and must say not kept up with the newer models. Last time checked electric fan kits all said not for big block nor diesel. Maybe they have come up in fan electric motor HP these days.
Oh well, you seem to be happy with the results and enjoy your ride !