Are there known conflicts using other security plug-ins

I have tightened up security on my WP/WooCommerce site: blocked ip’s, blocked all countries except the U.S., added captcha, addressed firewalls, honeypot, and have 2 security plug-ins ( All-in-One WP Security and iThemes Security) and much more at both the Server and Site level and for the most part I have no problems…. but these bot buttholes with their mailbox.imailfree.cc and numerous other imailfree.cc domains with random IP addresses and User names still manage to get 1 or 2 intermittent new, approved user registrations past my defense… It was previously a much greater number but I would still like to find a way to safely remove the issue without affecting actual customers from being overwhelmed by Two Factor Authentication, Captcha’s that make you choose images over and over again, etc…. you know the drill.

<span style=”text-decoration: underline;”>BTW, people with the same issue… blocking by Country is at the server level. If you have WHM, check here: WHM Admin / cPHulk Brute Force Protection.</span>

So, all that being said… all I am asking is if this plug-in has any known issues working with other Security Plug-ins. Knowing now would potentially save me A LOT of heartache and lost business.

Thank you in Advance, “K”