Here's some guidelines for better accessiblity.https://www.adobe.com/content/dam/cc1/en/accessibility/products/livecycle/pdfs/livecycle-designer-accessibility-guidelines.pdf

If Page1 is just the name of the page that holds that dynamic table, this won't help you to reach what your're after. The page will simply will have page breaks. There has to be another indicator which tells you, this is the page where the footer has to be hidden or not. But what is that in your cas...

Please define "title" what you mean by title. Is this a text element on the page that shows a particular title or it it the name of the page in the hierarchy or something else? Please provide some screenshots of how the form looks like and what thing you want to refer to.

In Designer, simply don't check the box for embedding images in the object palette of the image or image field.  

 40 MB with an image? You should think of optimizing the used images beforehand. Use only RGB images with 16 Bit or less and no more than 300 dpi. Also don't embed the images into to form, That will store it as Base64 encoded string in the XPD itself, which can't be compressed that good. Linking the...

Page numbers aren't a thing, okay. But what conditions have then to be met, to hide elements of the footer? It hard to answer the question without knowing the form. 

Use just one content area in your form. On you body page then place a subform that flows left to right. In this you put two other subforms flowing top to bottom, one for the main content and one for the additional.

I've testet this and was able to create a repeated and also dynamic header for a subsequent page. However it might be tricky to get this work as intended, since the XFA specs recommend static headers in flowing layouts.  If you know the maximum of possible columns, you could build one static header ...

Creating a dynamic table with multiple columns is not so complicated. You only need to wrap the the fields in all rows the are in the same column with a subform that ist set to be repeatable, like in this example.  Then you need a script that controls the table. Here it's placed in the exit event of...

A static form can't have any dynamic elements. To do so you need a dynamic form. There you can add, remove, show or hide columns by placing subforms in the table cells. Those subforms can be controlled as usual.