increasing upgrade level on production buildings

i played clash of clans for a fair while now (level 70) and i find that the collectors/mines bring in such a small amount of resources that i barley notice an increase in the amount considering how expensive things are getting for example 200-500k per wall segment is ridiculous that's anything from 3-6 raids and that takes a lot of time so these are some things i would like to be implemented in the game only in the idea for the time being and I'm open to any criticism and improvements on them

mine/collector increase

level 12 build cost 200k elixir/gold build time 4d 12h capacity 175k production rate 3500/h town hall level 8
level 13 build cost 275k elixir/gold build time 5d capacity 200k production rate 4000/h town hall level 8
level 14 build cost 375k elixir/gold build time 6d 12h capacity 225k production rate 4500/h town hall level 8
level 15 build cost 500k elixir/gold build time 7d capacity 250k production rate 6000/h town hall level 9

dark elixir drill
level 7 build cost 8 mil elixir and 5000 dark elixir build time 10d capacity 1900 production rate 120/h town hall level 9
level 8 build cost 8 mil and 15000 dark elixir build time 12d capacity 2200 production rate 140/h town hall level 9
level 9 build cost 8 mil and 50,000 dark elixir build time 14d capacity 2500 production rate 160/h town hall level 9