Those are pretty common gripes with this version in-general. To be fair, if the Allies under-perform in those battles (especially the SZ37 fight, if UK goes for it) the Axis are basically guaranteed a free win. Just yesterday I lost a bit too much on the Ukraine fight (took everything that could reach, only the 2 FTRs survived) and that giant loss of units through no fault of my own basically assured my loss by round 5.
My take is that you shouldn’t get too up-in-arms over getting your ranking up. Just set achievable goals and strive for them. It’s just a videogame-based-on-a-board-game, and said board game wasn’t really ever intended to be played hyper-competitively, at least I don’t think it was, anyway (doesn’t stop me and others from doing it anyway, though).
Your best bet is to just hold out hope that Beamdog starts adding other maps down the line. 42SE (the map AAO uses currently) is one of the most poorly balanced maps in the series, and lacks the charm that other poorly balanced maps have (G40 has its sheer size/scale + interesting political scenarios + tons of playable countries, AA50 has Italy/China, NOs and better overall balance, Classic has the allure of being “the original”, etc.). Beamdog is apparently open to the idea, but is struggling with getting the rights/licenses, since Larry Harris no longer has any affiliation with Wizards of the Coast (the people who own the rights to A&A).