
Simon, I wouldn't bother mate. Unless you have everything just right - which you won't in the winter, when there's a wind blowing, fishign deep water etc - you can end up either tangling or kinking the trace.
Take your baits out frozen, use big enough hooks, hook the bait on right and it'll fly.
For best distance have the lead on a link.
Opinions vary over whether you want the link longer the than the trace - several people on here fish like that - or slightly shorter.
The think which kills distance is having just a bomb sliding on the line, using those stems and anything which allows th lead to lag behind and slip bak the line as you cast. By the time you've tightened down, you've lost 10 or 15 yards.
The link stops this happening, even if you use a run ring.
If you're using really soft baits like sardine, there's a knack to hooking them. Don't just try and slide the hook straight in, rub a scale off first near the tail and close to the fish's lateral line. You should then be able to snick the hook point right into its backbone, which means you can normally get at least one decent cast out of them.