We also use full reverse thrust which provides a deceleration rate equal to that of the autobrakes at touchdown so the autobrakes aren't actually braking until around the 100 - 90 knot speed
That's strange. I thought the autobrakes actuated immediately on wheel spin-up which at max landing weight on a 737 Classic could mean a ground speed of 132 knots or higher depending on flap configuration. For most landings reverse thrust does not really get going until 20 knots below actual touch down speed because the engines have to re-spin up from the closed thrust lever position and this takes at least 5-8 seconds depending on how fast the pilot actuates the reverse thrust levers.