Furry, as long as we're putting it all out on the table, I don't think coach calls have any recruiting value (other than information). Back in the day, that is the one spot I used to think I had an advantage over you, so I never mentioned it.
When experimenting, I got the exact same response doing calls/letters/coach calls every cycle as doing just calls/letters (no coach).
If they have any value at all, it's a tiny fraction of even a phone call.