Client / Reviews Section Edit Questions - Can you help?

Hi there,
Domain: https://www.montaguevo.com/

1 In my clients section (towards the bottom), the logos are jammed together and not centered. How can I fix that to include better spacing and centering?

2 The testimonial box is huge, anyway to reduce the height?

3 Is there a way to pad the stars graphic so that it overlays on the top of the testimonial box? Like this, except the stars would be on top (vs bottom):
stars

4 I have noticed, sometimes, when I visit the website, there is no fill unless I refresh as you can see in the image below:

This is right between the clients and testimonials section. It either eventually fills or I have to refresh.

5 Lastly - how can I slow the speed of the testimonials?

These are all of the questions I have. Thank you very much!