Don't know where you'll find a map that details the kind of thing you're looking for, as nobody really knows exactly what areas were under whose control at the time. Fortunately there are a lot of good sources out there which give a rough idea of how things may have looked. Just have a look on amazon or the library; I do all my research in book form (as opposed to internet) so all I can do is recommend these books:
The Anglo-Saxons, James Campbell, Ed.
Mercia and the Making of England
Osprey books like: Anglo-Saxon Thegn; and Arthur and the Anglo-Saxon Wars
On another note, one thing you might consider is a very simple change in the startpos file of the Viking campaign. There's an area where you can set the Faction Behaviour. The Vikings are set to BARBARIAN_RAIDER, and thus are always bombarding other factions with tiny armies that will never hold the lands they conquer. Maybe, in combination with other changes, try changing their behavior to CATHOLIC_EXPANSIONIST or ORTHODOX_EXPANSIONIST (AFAIK the religion doesn't matter here; you can, for example, change the Welsh to BARBARIAN_RAIDER even though they're Catholic.... it actually makes for a rather interesting first few years if you're Mercia!). Maybe one of those possibilities will lead to them building more logical empires and thus getting stronger.
Also, just giving the Vikings some extra buildings might help. Once I tried this and gave them a trader building in Jutland and Hordaland, as well as a total of 12 Snekkjas and 10000 florins to start.
Good luck!
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