I've no experience of the Berghaus RG1 jacket but have used both Nikwax Tech Wash and TX Direct on various items with differing fabrics and had no problems at all.
Did you clean both in and around the soap dispenser tray of your friend's washing machine to remove any remnants of old detergent or fabric conditioner before you ran the wash cycle with the Tech Wash? If not it's possible that you may have picked up some old detergent or conditioner contaminants which have adversely effected the fabric.
As you can't make the situation any worse I'd recommend that you try hand washing the jacket in a large clean plastic bucket with the Tech Wash and see if it improves. When the jacket's fully dry test it under the shower to simulate the rain and see if it improves the situation. I know hand washing sounds like a pain but I honestly find it as quick if not quicker than machine washing when you take the time it takes to clean the washing machine before you begin and I find it gives better longer lasting results.
Nikwax Tech Wash Use gloves.
Immerse item(s) in 6L hand-hot water in a clean sink, bucket or bowl.
Use 150ml in medium/hard water* areas and 100ml in soft water areas for 1-2 items.
Agitate to mix, leave to soak for 5-10 minutes, then agitate thoroughly.
Rinse at least 3 times in clean water.
* If your kettle furs up you have hard water. For extreme hard water use 200ml.
http://www.nikwax.com/en-gb/products/productdetail.php?productid=4Nikwax TX.Direct Use gloves to avoid waterproofing your hands.
Immerse 1 clean garment in 6L of hand-hot water in clean sink, bucket or bowl.
Add 50ml of TX.Direct®.
Agitate to mix, leave to soak for 5-10 minutes, then agitate thoroughly.
Rinse with cold water until water runs clear.
Allow to air dry. NB tumble drying is not required to make Nikwax products work.
http://www.nikwax.com/en-gb/products/productdetail.php?productid=3Berghaus washing instructions are here
https://www.berghaus.com/waterproof-jackets/how-to-wash-a-waterproof-jacket.htmland
http://community.berghaus.com/knowledge-advice/washing-waterproof-jackets/Hopefully someone who owns an RG1 Jacket will post their experiences.