the size of tts represents the strength of its national army. Look how far the CPs went in the east compared to the western front.
For my own game (look in A&A variants) I am thinking about investing in Strategical Movement of units (cost 2 IPC per unit, max 5 IPC per turn-> 2 units per turn) maybe give Germany an advantage (1IPC per unit-> 5 units per turn)
Flash, you are talking about Railmovement in A&A for years, I would like to read your sophisticated rule for my own play. I guess the set up needs to be changed. And where is RM allowed? (Africa,Arabia?)