Sorry....As your title says....it is a power tilt unit. It is not power tilt and trim.
On the 20 HP's and below with power tilt, the tilt is designed to only tilt the engine up when not under way or to tilt it up when the boat is moving very slowly, like when going into shallow waters.
Even if you start out with the engine tilted up and apply a lot of power, the engine will come down.
That is the way it is supposed to work.
The 25HP's and up have the power tilt and trim.
If you find that you need to have the motor slightly trimmed up, you will have to adjust the tilt pin at the bottom of the engine. Unfortunately, you have to find the trade off of the angle that provides an a decent takeoff with a decent full throttle.
That may take some experimentation with different props, whale tails, rebalancing of weight in the boat ,or some variation of trim tabs on the boat.
Wish I have better news.
Mike