sfxmum - it's really only in the initial, most 'disciplined' phase of a low carb diet that veg/salad is restricted to 20g. After that, you can eat more.
One of the misperceptions about low carbing, especially Atkins, is that it's all about eating meat and egg (all preferably fried) and nothing else!
It's actually about eating unprocessed meat/fish and plenty of salad and veg - so lots of fibre. And, as you should be drinking lots of water, then there really shouldn't be an issue with constipation. I've never had a problem with it.
TGB - the thing about the snacks that you're eating is that actually you're adding extra calories. Although calories shouldn't really matter, they do come into play if you haven't got much to lose/are close to your target, which is why I was asking how much you have to lose.
If you're in ketosis, which you should be if you're restricting your carb intake to 20g per day, this acts as a natural appetite suppressant, so you won't get hungry, ergo you won't need the snacks! And sometimes, snacking is a habit - especially easy to fall into after a glass or three of vino!
There's nothing wrong with including bacon or salami or pepperami or pancetta in your diet - I'd just avoid having them all in one day. So if you know you're cooking chicken with pancetta for dinner, have an omelette for breakfast instead of bacon and eggs, and so on.