General way England goes about Africa, with a full Africa campaign, IMHO and as I have seen:
3 Infantry, 2 Artillery, 1 Mechanized Infantry, 1 Armor, 1 Fighter to Tobruk
Odds: 88.2%
Result: 3 Infantry, MI Lost 20% of the time
3 Fighters, 1 Tactical Bomber, 1 Destroyer, 1 Cruiser, 1 Aircraft Carrier to SZ 97
Odds: Calculators cannot handle 2 hit carriers or change in ool, done by LL
Result: 1 Fighter, 1 Tactical Bomber Remaining
2 Infantry, 1 Artillery, 1 Cruiser to Ethiopia
Odds: 40%
Result: Nothing left
So I wouldn’t say a British campaign in Africa is so over powering so much as it just kicks Italy in the shin, throws some dust in its eyes and runs away. If this is removed as an option, we may as well make England a neutral with allied leanings.
However, if you prefer, we can move the British fleet back to Gibraltar where it should never have been moved away from! Would solve the Sea Lion problem, but would only reinforce the need to buff up Japan (which, IMHO, was nerfed WAY too hard from where it was in OOB.)