Awesome, what gearing did you run the 12.5 on? 3.55? You're truck is wicked!
Is that the v6 electric fan? Did you notice cooling improvements switching to it? I ask because I run no mech fan and the stock efan with stock shroud and have not had any issues with 180 tstat and fan set to kick on at around 200 deg. While moving the coolant never gets above like 190-194, and when sitting it climbs, then the fan kicks on and it comes back down to around 194. Then I get moving again and the fan kicks off as the coolant cools down.
JW if it's only a space savings mod or if it moves more air...
Follow the instructions of the gear manufacturer. Just finished up my 500 break in and it was hard considering the route i use and i rarely use the truck during weekdays.
I don't know much about FI power band and peak but i thought the 3.xx ratios would be good on FI to make use of the rpm through the whole power band. It will go much quicker with 4.56's.