You have to understand what the lockout is for. Too many login attempts or 404 errors. Reason I say this, I had a client who kept getting locked out for no reason. After we investigated, turned out her fontawasome fonts were causing 404 errors on each page, so she kept locking herself out by simply browsing her own site.
Once we fixed 404 errors, problem went away. Whitelisting yourself is good too, but fixing 404s is even better.
Plugin has been having issues for the past 2 months. Make sure you backup before updating anything, in case it breaks something.
We upgrade our clients weekly (so they don’t have to worry about it), and luckily, there were no issues since my original thread.