Hill climb Time Trial pacing strategy for short steep hills? There are several hill climb events in my area towards the end of the year, from august onward. Most of the hills are no longer than 0.8km long and well above an average 6% gradient. The main ones I will be targeting are three climbs ranging from:
 0.7km, average gradient of 7% (and a max of 14%), personal best is: 2:25 

 0.5km, average gradient of 10% (and a max of 13.5%), personal best is: 1:51

and finally the local leg breaker (its hardly Colombia where I live I know):
 0.8km climb with and average of 13% (and a max of 15%), personal best is: 4:44

If I am warmed up correctly could I race each of these time trials in my respective power ranges of

1 minute (434W)

2 minute (374W)

3 minute (346W)

4 minute (340W)

5 minute (336W)
or would I stick to my ftp (220W) for the duration of the climb?


Sticking to functional threshold power is my current strategy but found it hard going just because of the steepness of the climbs.
Functional threshold power is defined as the maximum power you can produce for one hour. See for example, this blog.

Since you know that your events are much shorter, you don't have to be so conservative. And since you know your output for the approximate times those courses take,  you should plan that level of output for the race. 

Even with that approach different people will have different ideas on whether to go at the same power all the way or keep some in reserve for the steep bits.

My thinking is that the slow sections are where you lose time, so keep some power in reserve for the steep parts.