The only luck puka fishing Ive had with jigs (1 puka 5kg, 1 bluenose 15kg, countless gemfish) has come about by mechanical jigging but with a really sharp hard jerk with the rod, then a gentle wind down, wait a second then repeat.
I have found 500g at the least to be the most consistant.
Line angle is by far the biggest factor IMO, if the boat is drifting sideways you have pretty much no chance. If the dift is slow, or the skipper is idling into it your chances are way better.
For puka and gemfish I have found the bottom 10m to be the best, but bluenose it can be anything up to 50m up depending on the sign.
The most effective way to jig is when you have wind against current and the fish are sitting on the 'wrong' side of the rock for drift fishing, by positioning the boat on the 'wrong' side you can still get into the fish, when normally drifting wouldnt allow. All in all I dont think jigging for puka is as effective as bait, but it wont stop me from trying
Might help murf?