I over come the pop problem with iron city, and utilized the wood city to compensate.
Late game you rarely need more than 6 barracks with the exception of pult city or unless you have all instant troop hero than you can change over to 1 barrack and all cottages plus the essentials.
With the proper settings I have been able to store billions in resources, thats billions in irons and billions in woods without ever using any feeders.
Some cities I use 2/3 wood and 1/3 iron to keep a balance on idle pop and labor ensuring I have enough to train with. This method I use for distant satelite city that sending my main hero would be a waste.
Why Iron?
well, with a pure iron and pure wood city I can store excess iron on my wood city and vice versa, this way while storing excess resources I am not stopping any production, this means all production is pushing @ 100% without capping.
If I were to use partial wood and iron I cant store any extra resources without maxing out on either wood or iron, unless i have a pure wood or iron city within 30-50 miles.



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