moppo

What is the go with these soft plastics { Gulp }. I have been trying to fish with these for three months and nothing, today however i used a baby prawn, bingo a good size Flounder. I also use 3 in poggy, shaky shad punk prawn 4 in minnow ripple shad and others but WTF i can not get them to swim upright they all swim upside down doesnt look to real, I mostly use 1/16 nitro jig heads. All my mates around me a catching Bream Flathead etc on frozen bait. I have given it a good go but just about over it & ready to go back to real bait. CAN ANY ONE HELP?