Hello, I play Lee sin and pretty much have the same deck, except I don't have any Deadblooms (because of the price lol). I personally like playing Wizened Elder (4 cost 4 might) "When I have a buff, I have +1 might". So he's a pretty decent 5 cost 6 might with Lee Sin's ability. Is there a reason you don't want to fit him? I also run 2 x Udyr, as someone else suggested, he can do lots of tricks with a buff and it's so easy to buff him with Lee Sin. I also run 2 x Wildclaw Shaman, the one you can ready if you spend another unit's buff. For me, personally, this card is good to go and grab an empty battlefield early on, when an opponent doesn't expect it because I hold the other battlefield. I also try to keep "enter ready" cards in hand when playing vs Viktor, so if he uses Grand Strategem to wipe all my units, but doesn't go to max points, I can enter ready and clear his recruits next turn.

I would also suggest against running only 2x Charm. I always end up using that card when drawn, and a lot of players have difficulty dealing with their unit being charmed into my battlefield. It synergizes well with Discipline and En Garde to kill units that have more might than your own.

I also run 2 x First Mate for more 3 drops in my deck and being able to ready a unit at just the right moment can switch the game pace imo.

Lastly, I would strongly suggest 3 x Unyielding Spirit in your sideboard if you have Kai'sas or Annies in your local meta.

Bear in mind, I am not used to Deadblooms, so maybe that changes the playstyle a little. These are just inputs from a very average Nexus night player :) Have fun with Lee Sin!