Back door lifting

Since the RS rear spoiler added, the stock 390N shocks do not raise door that easy as before due to added weight , it's obviously.   (and door is too inclined anyway...)

Tried to change the shocks with some other higher power N , but then door ends up hitting when reaching on top  (did not have kind of smooth stop)

Skoda has another P/N for RS but still on winter times when oil is cold does not act as should wish, just in summer times it is a bit better than the weaker ones.

Has anyone fitted any decent brand to raise the extra spoiler weight with ease  and have a smooth stop up?

Also noticed there is an option in VCDS  (i think in 09 under BCM maybe....)   "rear spoiler installed " .
What is this for if being checked?

Following the above issue, when pressing the mid button in the fob  (trunk realease)  the lock tries to open  but due to the weight it seems it does not realease  (maxidot does not show open door).

At that time if i raise door with hand  (after button press)  it is realesed.

I think this needs adjusting from the 2 black rubber adjusters  in the end of the door, so that the  fob trunk button releases door?

Not sure if adjusting these, could lead to other issues like door would not seal well  and water could enter in boot?