There are a great many examples of commands on the link I provided, but it recommends what you have done, and suggests further research.
" You should perform as much varied research as possible and not rely on a single source of information. One of the largest security problems is the user. These are links to other guides that I find valuable:
Arch Linux Security wiki page
Whonix Documentation
NSA RHEL 5 Hardening Guide (slightly outdated but contains useful information nevertheless)
KSPP recommended kernel settings
kconfig-hardened-check