The 'He 111 lite' by the Tempest->Fury playbook:
Central wing section much reduced in span, so the outer wing sections are mounted close to the fuselage. Gets rid of the thickest part of the wing 'navigating' through the slipstream, combined with smaller wing area and span to give reduction in drag vs. the starting wing size. Yes, it will require that outer wing is reinforced for the engines and U/C installation, so starting with Bramo radials might be prudent. Make it instead of the Do 17 by 1938, doubling the bomb load vs. the Do 17, even if just the 8x 250kg bombs are carried.
Once that flies, up the engine choice (Jumo 211, basically).