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𝔒𝕨𝖑𝘡
If anyone has a ridiculous amount of play in their sram hrd levers, you need to replace/clean out the master cylinder.
I've got about 2-3cm of fore aft play at the Lever tip, and from all my researching it looks like the master cylinder needs replacing. There are a few YouTube videos online of how to do it and why it happens.
EDIT:
Replaces/re-greased/rebuilt master cylinder with silicon grease, also cleaned out all the gunk on the push rod and rebled the system.
On initial testing, brakes feel as good as they've ever done (I bought them second hand), so only time will tell whether they stay that way.
Followed this video:
https://www.youtube.com/watch?v=gqEHA2dRgqs&t=1170s