ORIGINAL: Lowpe
...I need to look and see how what the HQ supply drain is....I could perhaps move extra HQ units into the wild where they wouldn't draw supplies or something else...
No, that won't accomplish anything.
All HQs are not created equal when it comes to attracting the hidden extra supply demand.
In practice only a Command HQ will attract the extra supply demand. Then only if located at a base assigned to it. They have zilch effect if located outside of a base.
China starts off with only a single Command HQ, which is static, hence not mobile. Not till 1943 do any further Command HQs arrive in theatre, and they don't have any bases assigned to them. All the Chinese Corps HQs have the standard LCU supply demand, which in their case is not that much anyway. As a LCU, those Corps HQs, if located out in the field, will be fed supply from any relevant base whereas if located at a base they are fed only from that base's supply depot.
Bringing into China non Chinese LCUs simply exacerbates the existing structural supply difficulties. Expecting those units to both take replacements and upgrade devices adds to the supply difficulties.
Alfred