I installed the second fan on my 990 and have been watching the right fuel tank for boil-over instances - so far none, and its been pretty hot here in VA. No deflection shroud or heat tape installed on the right side. What I do notice is a much quicker cooling rate (time the fans are on when running as a pair vs one).
"Only a biker knows why a dog sticks his head out of a car window."
* 2012 BMW K1600GTL
* 2013 Triumph Scrambler
* 1982 Kawasaki GPz 750