Opened the kiln today. Still having the oxidation on the bottom shelves, but the rests of kiln are good.
The reduction agent reduced the rutile blue glaze, but pitted very badly. I may apply too much. Need further testing.
I am starting to catch the glaze bug. There was a test pieces for the celadon blue glaze, which does not craze, but got yellow-ish color. I sorta like the result, though. I used 1% of black iron oxide. I will try with 1% red iron oxide next time, and apply more thickly.