no worries, i think that is what this forum made for isn’t…we sharing and learn together
I installing using this way now, before I installing by downloading and unziping but there to many error.
check this install way
actually i copy this tutorial How to install Nextcloud with ISPConfig 3.1 but consider that hestiacp as the control panel 
nicely specs that you have there, perhaps you also need to check the network latency beside the installation or the specs
just suggestion, maybe can help you out