I will consider a change to enable a 301 redirect instead of a 302 from http to https. However, rest assured that the redirect is not important for google to know what url to index. If you go to site settings and check the box for all pages to use ssl, then the canonical url meta tag in the head of the page (and the urls in the sitemap.ashx) will reflect https and this is how google will know for sure the preferred url to index. I suppose in the absence of a canonical url and sitemap the redirect might possibly have some bearing but given the presence of https in the canonical url and in the sitemap there is no doubt or ambiguity about the correct url.
And I definitely recommend making all pages use ssl now that google is using it as a quality signal. I changed that on this site recently as well.
Hope that helps,