This is my usual army setup;

4 h4 Nag Cav
1 h5 Yari Cav
2 h1 Cav Arch
1 h0 Cav Arch
4 h5 No-Dachi
4 h2 Muskets

As you can see my fire power is about double of yours and those h0 Musks won't stay for long once they tire and are fired at. Of course I've not played in a while, but I remember that h0 Musks have a bad habit of not sticking around. Provided that the map would be relatively flat, I should be able to defeat you in the shootout, which should leave me with 4 depleted Musks and 3 full cav archers. These could be used to deplete some of your Yari Sams and any attempt to chase me would result in your loss of cavalry, unless I'm stupid enough to engage your cav close to your YS. Your best hope would be an all out charge at me, which you might propably win.

I believe you might be using h3 Nag Cav/Yari Cav which would be quite worthless against my cav without YS support, which severely limits their mobility at the early stages of the battle. Anyways trying it out would be good, although I believe that I'm severely disadvantaged in either scenario.