you reduce you pressure through your inline reg, with barbs your not supposed to use anything to hold them on apart from maybe a brass tophat that use to hold the lp hosing on the front of cockers..
If its new hose it should be really tight on the barb- you need pliars to push it on - push it on right to the top
If its new hose it should be really tight on the barb- you need pliars to push it on - push it on right to the top