That must be exhausting to be on the road for 5 months, I can imagine that you have so much impressions form different cultures and people and airport/pass control stresses. I would not do that only because if I am in a new place, I would like to learn more about that place and stay there for few weeks and learn more, relax and enjoy the time.
It seems you have a good experience in planning and you already have everything calculated and have like we causally say Agenda. It is nice to see that you stayed within your budget. I can imagine how it might be difficult to want to taste the exotic dishes but not knowing if you like it. When I am in such situation, my best choice is Pizza, of course some of them have different toppings but then I prefer Pizza Margherita. Beautiful pictures very artistically done.
RE: 5 months, 18 countries, 28 cities later - How much it costed me