I finally got my boot to open easily by replacing the motor with the later 2009 4E0827852H one with the metal casing. Wow, It took just 10 minutes to swap the part and instantly works like it should. I could now sit on the boot lid and it would tip me up. it opens much faster too. Thankfully I got one at a great price of £75 in these uncertain times. I would advise anyone who wants to sort this, don't waste money on new struts etc.. and look out for a 4E0827852H at a decent price.
I know there are various Nm versions, both my old and new are 164Nm, which I believe is one of the lower ratings.
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