I think i may have sussed the difference between my catching and not catching, it isn't the use of a PVA bag, the type of hookbait, it's the length of the rig, when I stopped using bags my rigs naturally got longer,probably to the same length as everyone else, hmmm I remember saying hookbait doesn't really matter its the feeding situation,
So in theory a pva bag full of 18mm baits with an 18mm bottom bait on a shorter rig is the ideal situation if its a clean dinner table, hard to distinguish which one is the hookbait, and they may trough the lot get nicked by the shorter rig resulting in more takes boom