Where do you see a "punishment"? Because they cant farm newbies anymore? Boohoo, cry me a river.
Some people do this on purpose, have a strong offense team to farm easily and a weak def so they dont rise out of the weak player fishing pond.
The concept is to fight amongst equals, get doable, but not neccesarily easy victories, which on the other hand means new players stand a chance and not quit out of frustration, so Plarium loses potential revenue. Come on, its like boxing, you wont see a welterweight fighting a heavyweight. The heavyweight isnt "punished" for his weight, but put into a league with others who have a fair chance to compete.
You are misunderstanding the problem, the problem is too high a percentage of players are in bronze and silver, and inactive whales are part of the matchmaking. This is because the system is naturally deflationary with downwards pressure at all times.
Fiddling matchmaking just screws over someone else
The answer is
1) Require setting of a defence weekly to only have truly active players involved
2) Add tiers past platinum to reduce the downwards pressure from G4 downwards
3) Stop removing excess points at reset to also reduce deflationary pressure
At present 60-75% of players are probably in bronze or lower silver and unable to progress great hall, by making the above changes that would reduce significantly. That coupled with requiring a weekly setting of defense would naturally make bronze and silver easier.
The whole idea of progressing in an rpg is not to make the content harder as you get more powerful,, which is why matchmaking by power is a horrible idea. Quite simply- The best teams should be in the highest tiers, but the lower tiers should be easier.