I have Mackeeper on the iMac, not yet on the MBP
At the risk of sounding rude;
$#!!%&! Run for the hills. Okay, that explains a lot. I knew there had to be something mucking up the works.
Even though I know that OS X is pretty much self maintaining except for cache cleaning once or twice a year, I tried it out just to see what it was about, big mistake. I launched it only once to see what it did, and it started installing crap. Besides the fact that when I first launched it it asked to do things to the system that I knew were not good to do automatically, when I tried to remove it it left error references to launch agents that it was trying to activate in the Console that repeated over and over every 10 seconds or something. When you drag it to the trash it asks to uninstall itself but it doesn't get everything.
Files to throw away to get that invasive POS off of your computer.
In system Library:
In User Library:
In Keychain Access utility: - all zeobit passwords
If I was sitting in front either of your machines trying to diagnose the problem, at this point my only suggestion is that you do a reinstall on both machines, never ever put anything like that back on again, don't mess with permissions unless you're 100% positive what it will do, and don't stick your head under the hood to try and tweak anything.
Normally a reinstall right over the current installation will do, it won't erase any users or data or apps. That is pretty painless and doesn't take long, especially as compared to the time you've already spent on this. I'm even leery of that though in case the installation of apps like Office have been corrupted.
If that fails, I would then do an erase and install and migrate only users and files, not settings or apps. Reinstall your apps, don't copy them over. If while copying or moving anything it asks for a user name or password, think 3 times about what it is you're doing.
Never trust any app that says it can optimize your system by removing files or tinkering with settings, and all of the maintenance tasks it does that really need to be done to OS X can be done for free in some way. The only maintenance I do on mine is clear the caches, repair permissions for old time's sake, and occasionally run fsck at startup. Even though I have DiskWarrior, I probably haven't run it in months.
I can guarantee that probably all of the problems you're having will go away with a clean non-"optimized" system.