My specific scenario - I log in, want to find my own last post in a fast moving thread like

https://www.jackinchat.com/viewthread.php?tID=96124

so I go through my own profile to posts

https://www.jackinchat.com/search.php?searchterms=&filterbyuser=phjacker

and I can see it. But when I click on it I just go to the start of the thread, page 1. So I have to go to the end of thread and scroll back through pages looking visually.

The other solution I've tried is to find the post like that and then search for text on it + my name + jackinchat on Google. No results.

Not wishing to hassle anyone, and if I still don't get any response I'll assume it just isn't possible.

But, just once, *bump*

Click on your name where it says 'logged in as'. Under 'Boards Information' is the number of posts you have commented on. Click on that number and you'll see the actual comments you made in descending order. Hope that helps.