Every time you kill tasks you only make things worse. Android learns your usage habits and you teaching it bad behavior.
Instead of trying to force Android to operate in ways it was not designed to do, you will get better performance using it as it was intended to be used.
The links in my post #2 above have a LOT of indisputable information as to why task killers, RAM managers, cache cleaners, battery savers and other so-called 'optimizers' are worthless or worse. Read and learn. Then implement what you learned, which is pretty easy since that basically means leave things alone and have fun using your phone.
Or don't. Continue making the same mistakes and getting the same poor results.
Android since v1.0. Linux since 2001.