Research
As I said earlier, the Germans have all the advantages at the beginning, so no reason to spend on early Research, in my opinion. After France I had built all the Mot. Korps that I could, plus a bunch of HQ's, all to help in Russia. Then I built all the Subs that I could, in order to attack shipping and defend coasts. Now I can focus on Research.
The categories for 653N are reduced/combined to make it easier for me to get my head around. I look on Research as being four main categories [blue] and I like to keep one of them active in each of the four categories at all times, for the Germans.
The green highlighted categories are separate and I usually throw something on AAA early on to help combat the USA/UK Strat attacks. The Naval Escort category isn't very important to the Axis as they aren't making any Amphibious Assaults. However, this category improves the Defense Strengths of AV's, AVL's and Transports [due to the limited available escorts in 653N, because capital ships have been removed]. So this category is handy for the Allies.
For the Italians, I invest in Industrial Technology whenever I can afford it, but I'm usually busy spending on keeping a small part of their force in decent shape.
