first of all i would like to say, its good to be back!!! boot camp sucked. 8)
now, on to the matter at hand……
Sealion is an accomplishable objective. However, it must be done early. Otherwise, the UK can build 2 INF + whatever each turn, and by the time you take out Russia, its a veritable fortress. The way this is accompllished is by the debatable German carrier. Get one out from the med and the UK will have no choice but to send its fighters after it. If the BB from the Med survives the initial battle, this is even better. send whatever subs you have surviving to use as cannon fodder against the UK planes, and start shipping over as many tanks/INF as can be spared from the eastern front. If the UK does become an impregnable fortress, you can always pull a shot against North america, landing whatever force you have availiable there to help distract the americans from the battle in the pacific.