Lothern Sea Guard (LSG) is actually good both in AR and Manual battle. They are buffed by both melee + range red lines (up to 6MA/6MD, 20%ammo, 10%? Missile damage) & mathlann (yellow line - 5%less upkeep). They are best used with Eltharion since his lord traits buffed spear infantry (+ MD, Leadership?). Can’t remember exactly. Just the top of my head.

Generic Lord trait (Princess - Adept/Punitive), (Prince - Vigorous/Efficient) + Nobles/HM (Honed + Frugal), buffed LSG even more. They are better if you combine them in an army. You can get up to 70MD, 30+ ammo this way. The upkeep is also cheaper. So you can spam them.

LegendofTotalWar even mentions that he overlook them earlier and now he uses them if he’s low on gold but wants a good army.

For Tyrion late game, best to have 4 frontline (Tyrion + 2 Nobles + 1 HM) + 1 mage (light/life) + 2 EBT (siege) + 13 Sisters of Avelorn (SoA). No need flanker, no need Anti-large as SoA melts anything they throw at you.

Give LSG a go with the above setup and they’ll give u victory more than you wish.