Maybe it would be better if one could raid bases that are decaying at least beyond a certain point, (a certain number of hours from start of decay??) I'm not a coder so I don't know how difficult that would be. I really don't mind filling the TC with "quarters". It's not that hard if you don't make a huge base, especially as a solo player. You could up the interest in VIP by making those raids a VIP perk. I love VIP BTW.
It all comes down to how smart a player is, when base building. If they want to make a monstrosity of a huge base....they have to keep working to feed it. It's the key principle of the game. If they kept it manageable, then we wouldn't have people whining about it. Some of these bases are ridiculous in size, unless you have a huge committed team to keep it up.