I wouldn't obsess over typos. I think the reviewers read through the proposals very quickly, so one or two will probably not make a difference and might even go unnoticed.
As for references, I didn't realize that others had so many! I had 4 this year and the previous year (prev year I received HM). Last year, my references consisted of 2 tenure-track professors (including my mentor), a non-tenure track faculty member, and a postdoc that I worked closely with. All references had known me for over 3+ years and I worked with them on a regular basis. This year, I've got the same references except I have a ref from a full professor in lieu of the postdoc and my mentor has become an associate prof. I wondered about submitting other refs, but they wouldn't be nearly as good and I'm not sure they would contribute much.