However i seemed to 'lose' a few softbaits that didnt stay on the worm hook?

I tried to rig them like this attached video, where he starts the hook through the 'chin' only halfway/middle of bait then pops it out to put thru the body.

Looked like the go and did exactly that but did not do the final hook into bait again type weedless thing.

Here is the vid i watched and followed  https://www.facebook.com/Wired2Fish/videos/10156211929357838/

Do any of you more experienced guys know why i would have lost so many softbaits by hooking this way onto worm hook type of heads ?

Any tips much appreciated ....... 

It's by Paul Senior, who was a bit of a pioneer of the deep softbaits in workups fishing in NZ, from what I understand. Trends have moved on, but I reckon you'd still get good fish using that method.

He has a special technique for ensuring the body doesn't come away from the worm hook.

one of the best charter skippers up north - Far North Fishing Charters who typically fished soft baits day in day out in 20m - used a similar copper wire twist method with his Z Man jerk shads that he had on every customers' rod (I think he's shut down his business now, but was very successful - so that is a good hint at what lures to use if you want something durable at depth - you're not having to wind up to check if your Gulp's been chopped in half after a decent bite).

I also recommend reading this article (again from the forum archives) by Stephen Tapp, who uses Trokar Flippin hooks down deep which have a plastic keeper on them. I have tried them, and they work very well with Z Mans.