a little nervous about that "FBI" scam still being on my computer
if you where able to boot, you should be ok. You should not be using an Admin Account for Day to Day use, if you are make a new Admin account with a very secure password, then change your Account to Standard. System Preferences > Users and Accounts.
Should I still do the "kill all Goggle/Chrome"
Yes, it won't hurt to do that. I would stick to using Safari unless you have a pressing need for Chrome. It's faster and more secure.
"Cleanup my Mac" or Mac Keeper"
NO, NO, NO... these are more trouble than they are worth.