Hello out there!

I recently made a typedesign and try to make it work for text.
I am quite satisfied with the spaces for now even though I know there is much much room for improving.
Yet what strucks me most is how bad it works on screen (and also in small sizes printed I assume).
In certain size letters begin to jump up and down the lines. A disaster.
I know this is a thing to be solved with the hinting tool.
Yet, I have to admit I never learned how to use it correctly.
I tried to do something in all charactes similar to the u I show here. Obviously I tried to keep values equal.
I suppose I have to add other hinting lines that prevent the characters from changing sizes in a vertical direction.
Is this true and if so how is it to be made?
Anyone there eager to help me with this prob?

Salute
Stefan