You are doing it wrong...you search until you next army is done and then attack the next base you can beat regardless of it's loot. You are pretty much automatically get your 30kish purple back if you win. Then go get your fresh army and keep searching. The cash crop for boosting really is hitting those 80-100k bases every 4 minutes anyways.
The first 2 minutes of searching you can be picky but after 2 mins of nexting you need to hit the next base that has 80-100k - in 2 mins you should be able to find this easy.








