The way to achieve your maximum power capability if you have the resources is to always make sure that the timers are going. This means that you have all types of troops training, buildings are always being built, research going and fortifictions. If you don't have the resources to do this you can always ask other Corps members for them either in 'Corps Chat' or the 'Mail All' feature. More often than not people are usually happy to help.
The key to keeping the power coming is to continuously do the Daily Quests and Corps Quests as they offer a lot of speedups, resources and gold which you can then use in combination to keep the timers going and build power at maximum capability.