sometimes your weight is best looked at over 4 week periods. It took me 4 weeks to loose 8lbs at 2lbs a week, which i was more than happy with. Even if you were to STS for the next 2 WI's, thats still the same net weight lost over the same time frame, just you lost 8 in one go. Its reconmended to lose at a rate of 2lbs a week ( so 8lbs in 4 is just normal and good and healthy)
Everyone is different, and it will take a few weeks to get to know your body and what works for you. some people find bread, even on plan, just doesnt help them lose. Its trial and error and every 'trial' takes at least a week.
So keep mixing it up, keep a food diary here, and at the end of the week post what happened at WI. then you can look back, see what you cut out, see what you added in differently, what makes the difference TO YOU.
SW really isnt a diet, its a healthy eating plan, with a side effect of losing excess weight
It does just need a re think on what foods you class as 'yummy' as the old foods that are indeed yummy are the ones that got anyone to carrying more weight than they liked........... for me its bread..... bought a bread maker in 2009 and on piled the weight, wasn't eating unhealthily, just cooking in oil, butter and thick slices of home made bread toast for breakfast, sandwich for lunch and toast as a evening snack!, chocolate and crisps etc, not to extreme, but more than i needed and on piled 2 1/2 stone!. but its ALLLLLLLLLLL gone now, bar a pesky 2lbs still from xmas which i have bounce around for 2 weeks! so i am changing what i have for a few weeks, different brekkie, more fruit, making superfree soups to have as snacks etc.