hiys kath
in answer to your question, you can eat loads of protein and stay in ketosis, white meat or fish, green veg/salad
also pitta bread is quite low carb, you can also have cheese, ham eggs and not come out of ketosis, up to 20gs of carbs a day and you will not come out, basically atkins diet is what you would be aiming for but slightly less calories i.e 1000 a day, steer clear of fruit and coloured veg as have lots of carbs, try vodka instead of bacardi as it has less carbs, diet coke is carb free but may affect your ketosis a little if you can have coke zero its better, mayonaise is fine to have as a dressing
sounds crazy but it really does work
for what its worth i think you should stay on ss and just take the weekends off, you will get where you want to be faster if you stay on it methinks
hope this helps some
nat