Hi, it might be some issue with your site’s htaccess file. Did you also rename wp-admin path?
Please let us know your site’s wp-admin login details and FTP details as private reply so that we can set it up for you.
Also let us know your HMWP purchase code.
That’s strange as HMWP is not resource heavy at all. This could happen if configuring HMWP leads to large number of 404 errors. Is this the case? If not what actually is causing the resources to hit the limit? May be you can ask your hosting provider and let us know.