Hi,
nice post. Well documented.
As for upgrading heroes at great speed, here is my input and experience:
from now to July, there is roughly 24 weeks. So if your queen is only 16, this means that you will need to upgrade her back to back for the next 24 weeks (7 days upgrade time capped)

And at the same time upgrade your king 2/3 of the times also.
It's feasible to gather around 100k DE for a week to upgrade your queen back-to-back. But as to gather 180k to upgrade both your king and you queen in a week ... that's a bit hard.
As a maxed TH9, you might be able to do well in war with one hero upgrading. How well do you do with both upgrading?
Let me just say that as a TH10, this is a lot harder.
We have 3 TH10 in our clan and if two of them are upgrading a hero during the same war, we lose 2-4 stars easily. In some case that is the difference between a win and a lost.
At some point you will have to chose between winning wars and upgrading your heroes. Mine are only 19-20 because I upgrade only each couple of weeks so I can have them for wars (twice a week).
No considering also troop donation during war. Each war it cost me around 20k DE (hogs, witches, golem). So add that 40k to you 180k needed to upgrade your heroes every week.
Anyway, you will see when you get to TH10. Upgrading golem to 5, lava hound to 2, minions to 6. You will see that your DE will go faster than it will come
Good luck and great work on your walls. I still have level 7 walls by the way
