Loopy - I found adding a strength aspect to my routine helped tone my body and make me look a lot leaner. We have the same protruding ribcage and funny belly - your back is a lot flatter though, luck you! Which means your stomach doesn't always stick out ten miles like mine :P
I switched from concentrating on scale weight to concentrating on my body fat percentage.
I do about 40 - 60 mins cardio most days a week and also 3 to 4 "body pump" sessions which are a 60 minute all over weights class. I also do a kick boxing class which is great for toning to upper body and legs and an "abs" class 3 to 4 times a week.
<-- thats me over there posing in the bikini lol.
*hug* good luck! You've already done a fab job