If you are ok with grabbing bots use Fascism or Tyr to get more land/less turns. Dictator gets you more shadow acres but the building loss can cost you more turns. If you want all-x there is a theory that Republic is good for exploring bonus.

Food you can sell on public if it gets crazy. If you get high mil tech the food sells for $38 on private market ($39 if Dem). So buying Agri and mil tech will get you more profit (without tax) on the PM. Spend what you need for military and building. Store excess bushels on the market @99+. Keep adding to that "stock". Save as much as you can. When you notice other player double in NW they are usually spending that stock. From here you buy out pm and wait for it to refill. You can sell if there's profit but don't sell more than you can buy back from pm. 500k spies is heavy. It just chews a massive hole in your food and adds to expenses. Buy spy tech if you want a boost.

Edit: Don't mix n match farms/oil rigs, oiler is a separate strat. Build some rigs for attacks or buy oil. Majority of your build is farms.