I'll assume you've investigated enough to conclude that RAM is likely causing your slowdowns.
My recommendation:
1 - Get rid of your Auto Memory Manager App. Unininstall it and don't install any more like it. I'm sure most people would back me up on this. Here's why:
http://androidforums.com/threads/pu...k-killers-ram-optimizers-and-the-like.896663/
2 - Look at what apps are perpetually showing in "running services" based on reviewing settings / manage apps / running services and also developer options / process stats. These are the apps that are grabbing high priority memory (maybe for good reason, maybe not). See which of these apps you can live without. Then uninstall user apps in this category that you can live without. Consider freezing (TiBu) system apps in this category but also understand that needs to be looked at carefully for each system app before you freeze it.
2A - By the way apps that show up only in cached processes (not running services) are costing you nothing. Leave them alone.
3 - Search MinFree manager, there may be a careful tweak you can try out if you still are having problems
4 - If there is specific app that is causing you trouble by being killed, you can promote it to always resident using app settings module in xposed. That doesn't get to the root cause (if you have too many running services you need to focus on #2 for the root cause) and doesn't help the system as a whole but it will help performance of those specific apps that you promote. For me I have experienced the system killing of Google MyTracks and Navfree (old version)... this seriously disrupted the function of the apps (MyTracks lost track of my run and started a new run at time 0.... NavFree just lost track and had to recalculate route) so I promoted them to always resident and it helped. By the way some apps will ask you (in settings) to place a persistent notification in the notification bar to help keep them resident (Tasker, Swipepad, maybe notification toggle). You can promote them to "always resident" and it'll accomplish roughly the same thing without having to keep the notification present (cleans up your notification area)