Your definition of East London is interesting. Stratford is the furthest out you go, and you only have a single place there. If you compare “East London” in your initial picture with where you actually have pins, you’ll see how big the disparity is - it’s basically east central London.
Couldn’t you lower the numerical threshold for inclusion once you get east of Tower Hamlets and Hackney, say? It would be good to see at least one place in Redbridge, Havering and Barking & Dagenham, and some more in Newham.