Yes, it sounds like your bread is over rising. Be sure to grease your wrap as well, so that it doesn't stick when removed.
For the egg wash, let it sit a moment after you whisk the eggs. You're beating in bubbles, and they are getting brushed onto the bread.
Hope this helps. ~ MJ
July 16, 2015 at 9:44am
In reply to I've been making Hokkaido Milk Bread using the tang zhong metho… by MyThy Huynh (not verified)