Bigfoot49uk: At present I'm using the Taylor Made Spider.
This is probably the biggest reason you're struggling putting. That slow meter is nice I suppose but you pay for it with accuracy. Try the Daytona. It's twice as accurate, has a 5th scale and a slow meter.
Also, if you haven't seen the Putting Tips in the FAQs, check it out. It lays out a way you can calibrate your putter, complete with pictures. Then once you have that figured out you can start using the larger scales for shorter putts, thus keeping the backswing short and making the ding easier. GL