~270 WE may look like a bug, may, but not necessary is a bug, every thing depends on overall situation on front. Show us some screens, show us were are your troops in Russia, show us the big picture not only parameters. If it is really a bug we will deal with it. The most important is the big picture. Look at Chuck AAR he is plying the same game and easily win with USSR. So one players says it is too hard the other seems to have a walkover.
Unfortunately, it's the not the right experience for a normal difficulty game where the Germans have rolled over Poland, France, England, Yugo, Greece, plus all of the Middle East.
Fighting consecutively weaker countries it is not the same as fighting with USSR. Giving the ww2 history to expect a walkover through USSR... Would it be fun to win easily with USSR?
“Very easy” setting is for really easy games. Normal setting is meant to reflect as it was(of course it is extremely difficult to make perfect balance).
Another thing worth noticing:
SOV
GER
250 versus 400PP netto per turn? Well I might be wrong on this assumption, but it might mean that in your game at this precise moment (in 1941!) USSR gains less PP then Germany(?). German industry managed to eliminated the gap between Soviet and German military production in 1944, but than the war was already lost, so maybe we should... help Soviets to have even higher WE?

Seriously I really need more information form the front.
And regarding high values of WE for Soviet Union - 3 shift every day (night production!, German factories work only in two shifts, so we have here almost +50% of efficiency per factory), low of quality of production and marginal production of non-military goods ( it caused abysmal level of supply for civilians in Soviet Union, while Germany produced a lot of civilians stuff till 43-44; in ToW we have only military production) and we have reasons for such difference and high WE.