I've been a bigjet pilot for 38 years- I still can't do a balanced manual brake landing
You certainly appear to have a problem. On the other hand full marks for admitting it, since few with your experience would have the courage to do so. Might be a good idea to seek further simulator training in this regard. One technique I have heard recommended to aid accurate manual braking is to scan the compass heading and if it varies then you may be applying unequal brake pressure.
