You are right, the indexing was not complete (I thought it was).
It raises another issue, though.
Now, when I search for a SKU I get ... too many results!
At least, your algorithm seems to work well, because when the right products always appears on the first position, but SKU search should definitively be an exact match search, otherwise it is not very useful.
If this is something I can set in my Algoria's dashboard (or anywhere else), it will be fine, but I really strongly believe this should be at least by default an exact match search.
As far as your second question is concerned, I do indeed prefer without the borders! But I admit this is a very personal taste. That is quite easy to remove via CSS so, I would not have asked it!