So , since this is the mod where you choose your skills as you like ,some have 0 athletics some have 6, some 4. And since you can freely choose what armour you want , some have light armours, some have etc. So all these factors influance your moving speed, which makes moving in formations hard. So i got a super brilliant excellent amazing cool glorious magnificent idea
WALK
simple, you press a key and your char starts walking slowly at a constant speed, so even with 0 ath and heaviest armour you will move equally fast as 7 ath and pesant robes, would help getting better formations