WOWSA!
I thought the same thing when I first went into Victoria Secret. However...and I'm almost ashamed to say this - by far some of the best bras I have EVER owned. Granted - I don't have many due to the price - but I do certainly wear them and spend the money. Good news is - that they seem to hold up incredibly well and last a good long while.
Instead of complaining that the rosebush has thorns, be happy that the thorn bush has roses. 

You go girl!! I haven't attempted the VS fitting yet, mostly because I know they are exspensive for my budget. However I have been trying on different bras all over the place and had the same size change. However I am not as happy about it. I kinda miss my big boobs. I am adjusting. Finding the right bra is a wonderful thing.