New answers tagged ergonomics
Try changing the seat angle. I'm tall as you, and had the same problem. I changed to a bigger frame, but the real solution was to set my seat a bit off the horizontal (back is lower than front). Seat and handlebar are at same height. No more sliding.
I would try some different shaped saddles. Possible your Brooks is too wide which would encourage you to slide forward. Your KOPS (knee over pedal spindle) may be too far forward as well which won't help your situation. You might try pushing the seat back on the rails a couple of cm and shortening your stem to 100mm. Try different saddles first.
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