devtrackers.gg
For integrity changes, I would suggest doing a blog post of some sort, a week or more before it goes live, with the exception being Hotfixing newly released content.
Div-o-matic has been in the game for a long time, and having a major change to it, and what it effects should be addressed before hand as to why you're making such a change.
Other issues that came out with today's Patch include the TH key icon in the inventory. Why does Jagex feel the need to promote it there while it's shown in other interfaces, and when you log in.
It's hard to say if this will stop Reddit from being a Echo chamber, but it would go a long way. I would say it is obvious that integrity changes, nerfs (clue scroll before hotfix), and MXT updates will always have some backlash, and you need to be prepared for that.
I've had a few talks with Shauny today, and this is what we're planning. Some form of new category of dev blogs discussing topics we're bringing up in game revolving around the health of the game, and changes to preserve it. This involves the Skilling Council, the Combat Council and CM.
This would only really cover that topic of things however, the Treasure Hunter changes are outside of my or Shauny's remit and are handled by other people.
EDIT: wasn't too clear on the dev blog idea, these would discuss future updates before they came out, so nobody should be caught blind by something like this change. It also gives us an opportunity to gather rounds of feedback on how exactly to go about some changes.