Just wanted to say thanks again to all of you. To wrap it up, here's what I ended up doing:
Started from Fortescue Bay around 830 to Cape Hauy (a pity they turned it into a highway), easy walk all the way. Dropped the pack at the junction to Mt. Fortescue, played around at the cape for quite some time. Then on to Cape Pillar via Mt. Fortescue, found it rather steep especially after the "summit". Lost the track there somewhere for a bit, and got confused a few times since all of a sudden the markers stopped so I was never sure whether or not I was still on the right track. Again found it rather steep getting up the Cape Pillar track. Ended up camping at perdition ponds although I really was very close to camp just anywhere as it had been a very long day and I was pretty exhausted by the time I reached the ponds. But some guy had told me about the ponds and it sounded nice. Was worth it though, definitley the nicest camp site of the whole track in my opinion (don't like camping in the forest). Lunchtime Creek had plenty of rather fresh water. PPonds were okay for cooking. Next morning to the cape (The Blade only), beautiful spot with an amazing view of Tasman Island. Took longer than expected (1.5 hours maybe? Not sure anymore). Then back to Fortescue Bay. Walking time on day one: around 9 hours including around 2hrs break. Day two: probably around 7 hours including maybe 1 hour breaks.
All in all an amazing walk; Loved the capes, perdition ponds/cliffs and crossing the swampy planes back to Fortescue bay with all the flowers. As a 2 day hike I'd say it's not easy but certainly doable (I'm not the fittest these days and as mentioned found the first day rather exhausting).

- Tasman Island from the blade/Cape Pillar
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