Yeah, because it's not the stressed vowel in the word it's probably for most of us a sort of rounded schwa more than anything else. The commercial I'm arguing with has a whole mid-back diphthong in there, which sounds more wrong to me than a whole high-back one. But I'm interested that you think you have more "o" than I think I have; maybe it's a regional difference. (People often talk about going on a "tore" of the White House, for example, which I don't care for at all but have learned to let go.) (I'd even rather have "too-er" with two distinct syllables, if I can't have "tour" as I pronounce it with about a syllable and a half. But what can you do.)