Ruy
I am afraid heavy bombers' escort did not used levelled escort. Aircraft, in sections of four, flew along bomber stream, some 100-200m higher. Range extension allowed to make sweeps by fighters further inland of enemy territory, thus expanding safety distance from bombers, thus reducing duties and responsibility of direct escort.
Tactics and formations are quite complicated issues that did not get enough attention in published works, no doubt, but I am afraid having no 'draw' possibilities, it would be extremally hard to explain that in written.
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