I have only briefly tried them on, without climbing in them.
They just didn't feel right for me: when not worn the upper forms a lot of plies, doesn't seem very tight. The velcro closure seemed absolutely useless.
They are in many online shops with heavy discounts here in Italy, this is never a good sign.
Anyway Sportiva shoes in my experience stretch a lot (even Solutions, which have a lot of rubber and should not stretch much), so going down half a size won't probably cause much harm, although I don't think it will solve your issue.
Why don't you try the Futura? They have the rounded sole, but the closure is quite good and the heel should be good as well.