How to change defaut text height and position for new created tables?

Not sure about position, but table text height is based off the drawing option "drawing_text_height". The value present in the drawing at the time the table is created will determine table text height, the spacing around the text, and the row height. Changing the "drawing_text_height" after the table is created, or adding/copying/moving the table to another drawing with a different value will have no impact. For this reason, I typically adjust the "drawing_text_height" BEFORE creating the table, then change it back to whatever it needs to be afterwards.

Tomas, when you say "position" do you mean text justification/alignment?