How should strapless bras fit? I'm a 32E/F (usually an F) and currently have both sizes that I'm trying on. It's a little tighter on the back than what I'm used to but there's a band of very 'sticky' grip tape and feel quite safe in it. I'm not sure if I should opt for the E or F? The F is a little roomier but I feel a little safer & snugger in the E - any advice on what I should be considering??