Question: Oh and i noticed that every battle has the AI turtling in a corner of the map unless they massively outnumber me.
Is that supposed to happen? Because every battle just has me rush my pike/swords into melee supported by archers and then i raise game speed to 10 and watch the fireworks.
I don't know of any mods I'm afraid.
Yes, that tends to be how the AI works, however there are better solutions than just piling in:
Firstly you'll notice that the turtling process begins with different groups of units, so it tends to leave the archers behind, which can be intercepted by a group of knights, or perhaps macemen.
Secondly you'll see that if you send in your archers the computer will respond by bringing his archers forwards. If you shield your archers with a wall of pikemen, then you can take these guys out relatively cheaply (the same tactic is true of sieges).
Thirdly you'll see that there is a point where once you've shot at them enough, they break turtle formation and chase you. If you've superior missle troops, you can use this to bottleneck them into a bridge or similar, thus minimising your losses.