As for the Determination sepuku trick. If you're worried about it ruining your day just paxk x1 Soul of bushido. I had it in there in an earlier version, but most people don't run det, and the ones that do usually save them up for HK's.
Right, but then that's one more card you need to fish for in your deck to pull off the bomb with full certainty. Like most things, you can probably come up with a suitable response for meta, but the hard part is trying to manage all the tricks that can get around a dishonor bomb, particularly those that stop your victory condition cold. Nonetheless,
dishonor bomb is still a very viable and competetive deck. I hope you don't confuse my past statements as saying it's not, but what I am saying is that a dishonor bomb deck is also fragile. Many of the same successes and problems Scorpion have with the dishonor bomb are similar for us in the Dragon as well. Like our Scorpion courterparts, a well placed Desperate Wager can be effective too. However, being Dragon you're guaranteed an extra turn versus Unicorn, Crab, Mantis, and Scorpion militaries, which can make the world of a difference.

As for holding Determination for HKs against you, I guess I can't see why they would do that unless they feared Turn of Fortune. However, my view is that you can't have it all and like DVD Dishonor bomb decks there's a limitation to how much you can include outside of the massive card draw in the deck. Though I'm personally surprised more people aren't running Determination as it's generally effective against dishonor, negation, and redirection.
Yea is another honor runner is running HK it can put a cramp in your style. Although most honor decks don't run it with the exception of beniha crane tricks.
It's also fairly common in some of the MST military/honor switch decks and then you have Impromptu Duel which is fairly common to Crane, Phoenix, Dragon, and occassionally Lion, which can slow down your honor gains when they target your Masujiro. What I'm trying to say here is that honor running can be a fairly tenuous affair. I think it can be worth it in many cases, but it's a delicate balance there to win against honor decks with switch potential that play "tango" with you. That was at least my experience with it. Pretty much if an honor deck could make it to the early-to-mid 20's before I drew the bomb, I definitely had trouble. That's a downside of not having DVD as it's harder to manage your opponent's honor.
Had I had district governor in the deck(I don't own 1), Where it was in the holding scheme would have given me the extra turn I needed in all of my losses. So suffice to say it should be an auto-include.
Yeah, I didn't have that card yet when I was testing this style deck, but it sounds like a good choice.
I thought about pulling saya for honami(same gold cost, honami is guaranteed extra honor loss and great with DG), but that would only leave me with x3 sammies for stay and if I pulled them for walk i only have x4 shuggies, even with the inclusion of k'mee.
My gut is Saya is probably the better choice. You're pretty tight as it is and I'd be wary of adding another trait to the mix which you need to rely on (Shugenja). The other thing is that Walking the Way costs gold and you're already "paying" for card draw from Sushi Stand, Shrine to Fukurokujin, and Unbiased Advice. If your thinking your economy can afford it, then it might not be a bad idea. Though you do have much less options for control if they decide to blitz (as Saya either provides lockdown or a decreased threshold for the bomb) and you would want another method to kill one of your peeps to drop the bomb.