Keen to give trolling a try over winter, and after tips and hints on how to improve my success.  In the past I have trolled a selection of different Rapalas, Yo-Zuri and storm minnows with rare success. Most of the time they seem to be swimming correctly. Have also tried trolling Woolly bugger flies a couple of times but never had much luck in getting them to swim properly. 

I am a bit uncertain how far behind my Yak I should keep the lures?

Sometimes I paddle just in a straight line, other times I do constant zig zags. Neither have produced so far. I try and sneak in close to the willows and zig zag through areas of current for not much.

I do most of my trolling in the evenings in the lower Wairau river, with the occasional trips to lakes further inland. 

Try a large black and gold Toby.

I think if you describe your rod, reel and line set up you might get some more accurate information / tips.

If your not getting snagged your not fishing in the fish zone.

Also rig the hook so the point faces up, it will reduce snags considerably as the lure will bounce over them.