Sorry to re-hash this thread. Though thought I'd give a final update here with the Helki.
If people have the same issue with Paramo, just some simple points might make the difference.
In the Mendips, I had a terrible time with the helki. The jacket was brand new, though it soaked through generally made me miserable on the trip.
Firstly lesson never wear cotton underneath . If you have one big sweat session, as such, it really can overwhem the inner liner.
I washed TX direct in and tech washed the Hekli. I changed my rucksack. Did away with the Montane Cobra, as directly pressing on my back. Now, have a Lowe Alpine, which has a air flow system.
Done 9 day in the Peak district, some real bad weather. The Helki performed perfectly. I wore nearly all the time and it never leaked though was getting a bit sticky inside towards the end though
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These changes have made a world of difference.
I think sometimes with any Paramo products. These products can be sitting around in the warehouse for ages. I think thats what happened with my jacket. The first time out it was soaked through, but nothing a tech wash didn't sort out.
With all my Paramo stuff. I am keeping to a schedule of making sure the products are tech washed as per instructions!