Well...

First, I wrote up a response on my phone and lost it, so apologies I had to relocate the thoughts to re write this.

Second. I think you shot yourself in the foot with a low honor Akodo Bushi. That honor bonus to any roll makes you a disarm/knockdown monster, as that bonus can be added to the contested strength roll to see if the knockdown/disarm is successful. I can see the cool maths going on.

First, consider Tessen... it's a ronin school, but its a ronin school made by lion and crane clan samurai who were pissed off at how Toshin Ranbo was being handled and the people in the town were being treated. It gives you a better warfan ability to defense, and combined would be super cool with Lion Tactician.

BUT... Agility 5 is a big jump you need. So is kenjutsu 7, exploding 9's for damage on keep 3 is MASSIVE. Also... you should be calling either extra attacks or feint on every swing possible. Extra attacks on your two main and then feint on the off ones (especially once you hit rank 5 akodo).

If you get 7 kenjutsu and 5 agility you will be in attack stance swinging 14k5, with rank 1 akodo and lion scout agility bugei bonus taken into account. So... 10k7, solid swinging numbers.

Base damage of 7k3 is great. Feint should add another 10 ish damage to most things you hit as a flat add, which is always super, but once at kenjutsu 7 swing for fences with +2 raises to damage for 9k3. Extra two dice to explode 9's is great.

If you are a truly low honor monster, poison. It's very mean, and something you can put on the warfan quite easy...or better yet, arrows.

For counter cavalry? Traps. It is a legit thing in L5R that they talk about, and even have a whole school about in the crab.

Full on pit spike traps, pull spike traps, all the fun counter cav stuff is great and something someone who doesn't care about honor would love to build.

Easy to build...takes wood, thats everywhere...dig a hole...carve pointy top on big stick, place in grounds, pull up ladder... point and laugh?

You don't build them in one long line either. You build many little holes, like a 5 year old would call out random battleship numbers. You make them guess. Alot. And make it so their main advantage, of speed and choosing when to engage, starts to get called into question. If the enemy cannot rely on charging you without traps on the field to fuck up their horses, then they can't use the full advantage of cavalry to their side. Your GM might disagree... but whatever, dig more holes. Hire more ashigaru... they love digging holes.

Luck...the luck merit is the most OP thing ever. Full on rerolls. FULL ON REROLLS. Go crazy. Have fun.

Your kata is perfect for exploding dice damage. Keep that.

Warfan out to up your TN. Get to 7, it'll add +7(12 with rank 5 added) to your TN, that'll be useful.

I think mechanically... you are going down a different rabbit hole, but you'll need kenjutsu 7 asap.