I have the same issue, any fix for this?

None that I know of. With the last mod using the battle sim mode, only work around was having 2-3X more troops. The problem was with the crossbow skill and some how only applied to the player's army.

The creator of the mod responded this in the comments:
I do have a way to fix it...but atm I'm pretty happy with the difficulty (which is very hard obviously). Maybe I can make an option to reduce it with a separate file.

Seems its intentional.

weird way to balance things. I thought this is a bug too

It's Actually fixed at this point. Range starts at 150-175 yards.

Enemy still shoots at player troops from far away, while player units are just staring at the enemies. Feels very weird.

Still an issue, player troops are significantly out-ranged by enemy troops

This is still a problem.

Kind of fixed it, but the work around only for my troops. Have my little warband and setup several troops up to T4. T4 being riflemen. Turned off the limiter for the skill cap, The build method only focuses on three skills. Athletics, crossbow and polearm for the bayonet. T4 runs with around 175 in each, acc range is around 75-85% at 150-185 meters. That's in addition to my lords skill benefits. Issue is with the mass battles. My infantry don't spawn and my allies are in love with pistol cav. Brainless chaps get butchered by enemy musket troops. The army never does have enough muskets, and having the cannon facing the wrong way doesn't help. Doesn't matter if the cav is in the line of fire. Also have RBM running, so at least it is organised stupid.