and why would you want to go above 20degrees?
What's wrong with going over 20 degrees if you need it?
Either you have screwed up the rotation and be at too high IAS, or you are way over powered.
Occasionally I am required to carry out a full power take off in an empty, and I mean empty, aircraft with 5 tonnes of fuel on!
Either way your initial climb-out trajectory will be more than enough.
In the above case you need the pitch to control the speed otherwise you get very close to the flap limiting speed before you can say P45.