I forget the exact numbers but once you're over the coastline and in Oceanic airspace you should be doing about M0.95. You then have to re-ignite the afterburners until you reach about M1.5. Also, once you get to about 40000ft you should go into a cruise/climb where you climb at about 500ft/min. Any faster and you will lose airspeed. I don't have the book handy so as I said, these numbers may not be 100% accurate but I'm pretty sure one of these two solutions should help.