Hi,
Can you check this similar discussion: goddady installation.
Also: PHP INI files and Goddady's hosting.
We do not plan to make any new benchmarks, because the results will be identical. If you use a plugin that requires to have WP + the DB + the plugin(s) loaded, it will kill your server if you face a distributed attack.
I do not know about any issue with the Sucuri plugin. NinjaFirewall works before WP and its plugins are loaded so, in most cases, there is no conflict. If you see any issue, simply report it here.