I don't see any problems with that. Probably wouldn't hurt anything. Those are solid times for a sophomore. I sent stuff out to coaches after my junior year...times, basic training info (I didn't run much so I thought that showed I still had a lot of potential...not sure how this was viewed in their opinion), and major awards (state championship/member of all state relay team, etc).
I think what others mentioned above about getting on a coach's radar is important. I probably sent out 100 emails to just about any D1 school I was interested in. About 25 of the coaches eventually got back to me with form letters, etc, and some started calling my house (I don't think they're allowed to do this until a certain date because of NCAA rules, can't remember when that date is). Eventually I was able to narrow things down after speaking to the coaches once a week or so. Made some visits. Ended up going to a upper level ACC program.
Go ahead and send some emails. Don't some will get back to you, some won't. It never hurts to ask. Also, you run a PR, re-send that. Let them know you're improving, even if they haven't responded yet. In my experience, especially in a sport like track, you have to do a bunch of the recruiting yourself unless you're a foot locker type guy (even with a handful of state championships under my belt the vast majority of the coaches had never heard of me until I reached out to them).