Hi Gingernut...
You've been given some really good advice by everyone, I hope you can read it and make SW work for you.
For me, the winning thing about SW is the free food. You need to base your food every day on things that are free on whatever plan you're doing that day (red, green, extra easy).
Then, you just enhance your meals with the Healthy Extras and Syns.
You should NOT be basing your diet around the Healthy Extras and Syns. If you are, which it sounds to me like you are, then no wonder you're feeling hungry and deprived and want to give yourself more syns. But this isn't the answer.
You need to get WW totally out of your head. Stop comparing them. They aren't similar. If you really want to give SW a good, fair go, then forget whatever you did at WW and start afresh, learn the SW way of eating inside out and get stuck in there.
I did WW for a long time and lost 4 stone. I loved it at the time, but when the time came for me to lose again (after gaining a couple of stone back by following the 'wine and pizza diet') I decided the new challenge of SW was what I needed. And I love it.
Have a good go at it, and then decide whether you need to switch to a plan, like WW, that allows you to spend your points on whatever you like...that might suit you better.
Good luck.