Stretching problems

Dear tpf-ers,

I have a stretch problem with louboutin and would like your help. My first two pairs of louboutins were patent lady peeps 150, in 39 they were perfect in store and stretched a little bit (a party feet was enough)

The second model was Bianca in patent as well I bought that in 39, in the store they were great but afterwards while walking Paris I regretted it because the felt way and way to small. Despite them being to small I continued wearing them, now almost 1 year later they're more than a whole size to big. My clobber putt in a half sole starting right after my toes till my heel and this works.

All my louboutin wedges are size 39 and they are great.

Now I bought the pigalle follies in 38,5 (they were freakin tight in store and the first 10 wears were hell ) but now they feel great, just a bit tight at my toes..

The thing is I'd like to buy a new Bianca but I am really really hesitate what size I should get!!

Thanks I'm advance