I've decided to get out of my 1805 trance and am looking at other scenarios since you're working so hard on fixing some of the problems.
I looked into the 1813 scenario last night and the first thing that struck me as being offbase was there is no French supply depot with accumulated food and ammo at Dresden.
In my tome by David G. Chandler "The Campaigns of Napoleon" on page 902 he states this about Dresden. "Dresden itself, with it's great depots and camps, formed the kingpin of the entire system. "What is important to me is to avoid being cut off from Dresden and the Elbe," claimed the Emporer. "I care little if I am cut off from France." "
Napoleon spent the Armistice building up Dresden as his central base of operations so he could resume offensive operations to the east from it. In this 1813 scenario the French player has no skin in the game at Dresden and can easily abandon it. Building a depot from scratch on turn 1 does nothing to recreate this. I tried a test run by turning off the AI and then building depots at Hanover and Dresden, just like I saw the French AI do. Then I clicked through 3 turns not moving anything just to see how poorly supplied the French units east of the Elbe would get.
I'd also put 1,000 food and 1,000 ammo in the newly created level 4 depot at Dresden and subtract that from the depots in eastern France. That would make Dresden have the same historical value for the French player and would force him to protect it and to be able to work from it just as Napoleon himself did.