Grand Campaign on Updated Map 4TPY - makes the Grand Campaign use the newer and arguably better Imperator Augustus province and settlement layout, w/ 4TPY Sebidee Missile Knockdown - makes projectiles slow and knock down victims - adds more of a sense of weight and realism. Sebidee Mercenary Warfare - makes mercenaries more plentiful to represent their importance during this time period
Sebidee Roster Overhaul - adds lots of immersive, balanced units to all playable factions. If you do end up with more interest in Divide et Impera, check out this intro video by RepublicofPlay to see if it's something you might like, but in the meantime I'll just suggest 'base game plus' kind of mods.
I love DeI, and it is frankly the best overhaul, but it looks to me more like you want small modular changes that you can combine rather than a big package of changes.
