When you say another cache system, I have SiteGround Optimizer installed but I disable everything in the “cache” menu. However I have NGINX + Memcache toggle in my SiteGround hosting dashboard (not on wordpress). All I know is, if I disable the memcache in my SG dashboard, LiteSpeed give me error when trying to connect.
About the NGINX I don’t know if I have to enable/disable it.
I did what you ask : ZONRICUJ
Thanks!