To answer your question directly, on pump gas those injectors will hit around 90% duty cycle at the max potential boost that a typical 20g can make. so by the numbers, they should be fine. but listen to these guys, they know what they're talking...
Yes you can do it, but not with that check box. basically you'll want to trigger the fan Hi relays with one of the programmable outputs in link (FPS, EGR). Inside those programmable outputs, you can set whatever coolant temp you want to trigger...
make sure the little sub fuse holder that is supposed to sit right on the positive battery post is connected to positive properly. it seems silly, but that touching ground or not being connected can cause issues like this!