Do what your body tells you to - if that grilled cheese sounds like just the ticket, have it! You know the rules, just use low carb bread and fit it into your daily carbs. As for the meat, I'm like you with the nitrates and even the high fat count troubles me, so I opt for the leanest meats I can find and limit my intake. For example, only two pieces of bacon in the morning if any, with three scrambled eggs.
Sounds to me like you're doing really good - just hang in there, that stubborn old weight will come off! you don't want to lose it too fast anyway, 'cos that's when it usually comes rolling back a heck of a lot faster than you lost it!! Good luck!