aubreyq, your challenge is that confirmations are LIKELY to come only from especially accurate/fast typists. What you detect probably is affecting us, but not to a noticeable degree, rather to one that we can easily attribute/add to relative inaccuracy. For me, the Focus is only my second virtual keyboard phone, and a total of 4 months; I'm really struggling with accuracy and speed. The other factor is that there is a great deal of muddiness around the whole pre-/post-/only Mango matter. Some (like you, evidently) just moved to mango from a cearly non-mango state; some have been on Mango, or partly-, or mostly-mango for months; and some know only or mostly Mango. My sense from being here for a couple of months is that this second been-there group is pretty large and diverse in itself.
Anyway, that's a researcher's perspective: you are a member of a small population. Most of the Focus/WP7 universe will miss the subtleties that truly affect your group, but this does not make your experience(s) any less valid -confirmations or not. Hope that 7.5.1 fixes your (and our) issue; your "grumblings" here and elsewhere may help. Thanks.