Hi mate, It sounds like you need a controler float to set the hook, try the Korda inline controller, it acts like a bolt rig so it sets the hook. Also use a size 6 korda mixa hook tied using a knotless knot and use a d rig. 4-6ft hook lenght tied to floating line (Korda floating line is good). However, instead of tieing your bait onto the D, use a Rigmarole bore ring, you just scew your bait into it and away you go.
Hope this helps