I guess you're on Induction, right? If that's correct, then your menu looks great.
Yeah, during Induction it's hard to reach 20 net carbs -- I was not able to do it since I am not eating a lot of processed stuff and I rarely use sweeteners. As long as you are eating 3 cups of vegetables and get over half of your carbs from veggies, you're doing fine.
Check for hidden sugars in the hot dogs. The ones I find around here usually have some sugar.
Is the mild sauce prepared by you? If not, check the ingredients. If the carbs are really low, they are allowed to list them as 0... although it can be 1 or 2 if you eat more than a serving.
Your weight loss didn't slow down because you took out the sunflower seeds. During the first days, we are losing a lot of water as our body burns through its glycogen stores. After this water weight is gone, most of the weight you're losing is fat... and fat comes off a little slower. So the higher weight loss rate you've seen in the beginning is a result of water weight loss rather than "fat weight" and has nothing to do with the sunflower seeds.
Are you exercising? That will speed up things and it's good for your general health too.
Are you drinking enough water? Taking any supplements?