HoI is both strategic and tactical. Tactics come to the fore when dealing with specific types of troops, stacking, terrain, weather, day or night, blitzkrieg, surrounding the enemy, supply issues, on and on. If you have ever spent a lot of time outside at night, its much easier to have your bearings on position, direction, and organization, when you are stationary and defensive, and as compared to being mobile and offensive.
I indirectly mentioned this in another thread. I think minimal modification is key to a good mod, and focusing mostly on the strategic inconsistencies. I haven't played your mod, but I played another popular one and so far 1.3a is a much better and more historical game. I guess my point is that, fixing only glaring problems in the constitution (and, if there are any) of the regular HoI2 game is a pertinent point when it comes to modding.
So far, I haven't noticed any major historical inconsistencies in 1.3a, and I would think that this should be the status quo. So far, Gibraltar is the only thing I see that might need help (maybe a more historical Spanish army - not sure though) - Gibraltar is too big on the map, and stacking should be limited to 9 or 10 divisions there, or so, and as based upon a given regions carrying capacity. Past these kind of macro-issues, and short of being an ace at physics and its systemic simulation, modifications of the ground-plan should be far and few between, IMO.