On our 5 door hatch when the boot lever is pulled the hatch unlocks fine but doesn't spring open as it does on all the other hatch or wagons i have owned, as a result often when the lever is released the latch locks the door closed again and i have to go pull the lever again or get someone else to pull the door while the lever is pulled. Is there some spring or mechanism to check that should hold the boot catch above the latch when the lever is pulled?

The gas struts aren't the best, seems the rear hatch is too heavy for the standard struts as i have tried about 3 different pairs and non will hold it up, not sure if this is effecting it.