As usually there are no simple answers. Because we don't sail with instrumentation I don't have a good grasp for what angles we actually sail. But, I am not sure how helpful that would be. That is the wind we feel when we are sailing, and that is the wind that affects the tell tails. The faster we go the more the wind appears to come from in front of us, so the lower we have to head.
Apparent wind is a fairly simple concept, but it gets more interesting than that.
If we could sail upwind at a boat speed of say15 knots, and the true wind was only 10 knots we wouldn't be able to point very high at all because the apparent wind would be so far forward. To be brief hull speed is like a natural speed limit. The hull speed of any boat is affected by many things, but most profoundly by the length of it's waterline. Boats create a wave as they move. Since longer wavelengths tend to travel at higher speeds longer waterlines create a higher hull speed because they make waves with longer wavelengths.