With deep dives i normally use the 105 sniper roller or 100 carbon roller. The trigger mech is super basic maybe your spring is damaged??? You can get new springs from your pathos dealer.
I wasnt a fan.of the 1st model side line release. It was a bit sticky especially if you had the spear line through the hole at the back of the spear that goes into the casette. The tolerance was a bit tight. The pathos spears also have a hole in one of the sharkfin.