Thanks for the info lads, tried a few rigs out last night with worms.
I tried the d rig with foam under 4 worms threaded on to a maggot ring, worked pretty well to be honest, no worms caught the hook point, was well balanced and presenting well.
I put 2 worms on maggot ring with cork under on a small hinged stiff rig, also worked well.
I did try injecting the worms and presenting on a rig, after 15 mins the worms lost the air inside and fell slowly to the bottom, presentation was still ok but hard on the deck.