The forum does not keep edit history, but I can find your account by your email address anyway.
Yeah that's about right for Tommy's Plesk, but the websites themselves should perform better than the control panel does. It's a capacity issue...it was the major reason we had to move a bunch of people to Johnny instead of Tommy when we did the migrations for old users, and one of the reasons why we no longer offer free accounts on Tommy. For logging in, there's no need to use port 8443. You can log in at https://heliohost.org/login/ or just https://tommy2.heliohost.org/ and it will work just as well.
You cannot request the DNS resolver be disabled as it would break the server and is widely used by other accounts as well as Plesk itself. If you meant the name server that's built into plesk, that's already disabled.
For caching and the like, you'd need to request something specific and Krydos would need to decide on it and make the changes if approved.