Razing to break (judging by KD pages) is just dumb. To gain honor you want them to have as much NW. Killing both troops and land, probably creates too much of a gap. And 2 raze breaks give GBP, lowering troop losses.
The issue with Pyro's b2b strategy to gain honor (and science) is that Pyro has grown too much land in war. Even if it goes into a max meter war, the bottom half of Pyro would be able to take honor while the upper halfs gain very little. FS has a better position to gain/maintain their honor.