There are so many options like intro image, images in your text, full with, floating and so on. You probably can set all your paddings in your custom css in your template.
The quickest way to get the right answer is to raise a support ticket for this (https://www.acymailing.com/support/) and include login credentials for your backend so we can have a look at it.
Version 6 offers much better Outlook support. In the other thread you mentioned you weren't ready to migrate yet. Do you miss any specific features in v6 that are holding you back?