Note that hull *shape* is very important in "escaping" that stern wave. While truly "planning" probably will not happen with the weight we all carry around in our dual-purpose racer-cruiser designs, there are design factors that do let you enjoy more speed in spite of the water resistance.
Beam to length ratio is also Really important. Shape of the bottom and the stern sections is important. And total weight.
Case in point: out hull is flatter aft, without the pinch of a more-IOR 'ish shape. We have moderate weight, at 10600#, and our midship sections are arc-shaped, altho not flat. We have a long immersed waterline at a over 31 feet. Our beam is moderate, at 10' 10".
We have maintained a bit over 10 kts for hours at a time, with a small jib only, down wind off the WA coast in the afternoon 24 kt winds. Seas were about 4'. Surfed at times up to to 12.2. (Sister ships have gone faster with a chute up, FWIW)
The rest of the time we motor (and sail to weather)at 7 kts.
It does take a lot more energy input to exceed the designed-in limits of your hull!