I will do my best, but it might take a bit because i'm swamped with summer classes.
On a side note i wish someone had mentioned that buying the f4i sensor was a complete waste of money.
f4i ECT sensor will work just fine, it's wasn't waist of money, it was needed to make it all work correctly
Your ECU won't be screwed up either, f4i sensor and 919 have the same parameters according to honda:
Temperature 80°C 168"F 120'C 248"F
Resistance 2.1 - 2.6 kOhm 0.62- 0.76kOhm
and ECU receives the same values as it did with 919 sensor.
The difference is ECT's side that goes to gauges: 919 and f4i temp gauges are different and require specific values. f4i ECT has different internal resistor on the side that goes to gauges hence 919 ECT gives wrong value to f4i gauges
As far as fan goes: it should come on just like specified in the manual:
fan motor kick in 208-216F, out at 199-207F
your thermostat is fully open at 203F
If it doesn't come on at the above values, you have an issue somewhere else
PM me if you have any other questions.