I think the best solution to this would be to split overall NS and military NS. Overall NS would be like 70% infa, 15% tech, 10 % military ns, and 5 % land. Military NS would be troops times 1, tanks times 15 (15 troops = 1 tank), CMs times 5, Aircraft times 10, nukes times 20. This would allow for a true balance in military vs actual nation. Numbers may not be perfect, but you get the idea. Also, when you attack someone, it is by military 50-200% and overall ns 75-133%. that way the economies are balanced but demilitarized nations are not totally safe.