Upgrade path I was going for (I made some minor mistakes and adjustments during the run):

----------------London engine 1 control 1 model 1, throw 1 aerodynamics 1, lightweight 1 aerodynamics 2 (25 m/s)

----------------Paris engine 2 (30 m/s) model 2

----------------Egypt lightweight 2, throw 2 green-fuel 1 aerodynamics 3 (35 m/s)

----------------Kenya model 3 (40 m/s) lightweight 3 engine 3 (45 m/s)

----------------Japan aerodynamics 4 (50 m/s) lightweight 4 throw 3

Sub 13 was my goal and I finally got it. The grind was brutal.