When it comes to the text size what adjustments are you making and how are you entering into the interface? The reason I ask is because when I try this it seems to make the labels match whatever value I use for the text size. I did notice that I had to refresh the page so that the new style showed but the changes were being retained whenever I made them.
As for the text area at what point are you updating the size, in my test form I was just making adjustments to the size from the drop down select list to make it small, medium, and large. The changes I made here were reflected in the form.
When you are crafting the form to fit in a particular area you should ensure that the width of the form is smaller than the width of the area you are applying it to. Please post back with some more detail about how you are making these edits so that we can help you get it the way you would like it.