Well, I can understand your frustrations so far. Two things to consider:
If the production bugs make the oil rule this difficult, the easy fix is to play without it. In that case, you might want to add the Food in Flames option, so at least the CW gets a few extra production points each turn. Though it appears bugs could impact that one some too, unfortunately. An essential problem with turning all oil into Build Points is that only the Axis get extra BPs, for the most part. The Axis countries are resource limited far more than the Allies, who can maximize their production, use their oil units frequently, and still save up some oil, through large portions of the game. Also without the ability to store oil and use it in their factories later, the Russians are in a bit of a tighter spot as well, in a strong Axis 1941 Barbarossa situation. Food in Flames would help only some, as the Axis will be a lot, lot stronger. In a solitaire, no-oil game, I would consider anti-CW strategies as the Germans a bit more. Without an oil rule, an experienced Axis player could quite easily crush the Russians; even a very, very good Russian player. I think.
I have played with the Limited Overseas Supply option for a long long time. I like it because it makes the players fight to control the sea. Sure, without it you have to fight at sea as well, but being forced to protect supply shipping makes for a far more interesting game in the sea zones, in my opinion. A lot of people that play this game think the sea zones are just there to figure out where the tanks are going to land however. I'm not sure how the Italy/German sea supply issues are working out however, so that might be a no-go in a Mediterranean game.
Perhaps some people don't like it because it seems you have to use Convoy Points in the 0 box for that supply. A trick to consider when the action gets heavy at sea is to use your transports to keep supply open, robustly escorted with a single strong task force in the 3 box.... a risk for your precious transport, yes.
For the choice of combat tables, I suggest some run throughs of the Barbarossa scenario. Which frees the players from lots of the last few bugs crawling around in the game. Just ignore the ships completely (no port strikes), and get into the nuts and bolts of corps-level WWII combined arms combat, rather than figuring out which menu that one part of the game is run from.
Anyhow, thanks as usual for all you bring us, especially those of us who know they can't quite purchase yet, or else nothing whatsoever would be accomplished at a very busy time of year... wrapping up a major work project tomorrow I think .... hmmmm .....