I just saw that Steemit,Inc rolled out a security patch. My node is now up to date thanks to : https://steemit.com/witness-category/@someguy123/security-update-all-witnesses-please-update-asap-steem-in-a-box-is-ready-to-go
I use that chance to push my RAM usage to 32 GB (my previous limit was 24GB). I need to give a try to the zram setting.
Remember if you have some spare witness votes, Vote for witness @cryptohazard