Help with A+ content

I'm really struggling with a couple of aspects of A+ content and would appreciate help!

1) Firstly, the standard modules for A+ content are quite restrictive so I'm going for large images (designed off Amazon) which include both images and text so I can lay everything out exactly as I want. My competitors have done something similar and it looks great, but my images all look a little bit blurry. I've tried small-ish images, massive images at max allowable pixels and both JPEG and PNG but it never looks really good quality. What am I doing wrong / what can I do to sort this?

2) My current A+ content is very basic (just side images and text), when I go to 100% images (which will contain text) it will look way better, but is there a risk that my products will rank worse for keywords, as previously they were included in the A+ content as words, whereas going forwards they will be part of an image? Is this something I need to worry about?

3) My sales are very very heavily weighted towards the Christmas period, hence trying to improve my listing now for maximum benefit. But I'm a little nervous that if updating the listing this near to Christmas causes my products to be re-indexed and anything goes wrong at Amazon's side it could cause me huge problems. I don't see how improving A+ content could cause anything to go wrong, but I've heard sellers say that all of a sudden their products suddenly weren't coming up for any search terms and I don't want to do anything this close to Christmas that could potentially instigate something like this. Am I being ridiculous, or should I wait until after Christmas just to be on the safe side?

Many thanks!