Hello andyjee86 and welcome to Seven Forums.
This is just my personal opinion FWIW. Others may have different opinions. First, no antimalware product, even Malwarebytes which is excellent, is 100% effective 100% of the time. If there was such a product we'd all be using it and everybody else would go out of business. Second, once a computer gets infected, you cannot be 100% certain that all traces of the infection have been found and removed.
What I'd do is run a few more free
on-demand scanners like Malwarebytes
, Comodo Cleaning Essentials
, etc. Update the data base and run the full scan, not the quick scan. If any other malware is discovered, I'd definitely reformat and reinstall everything. (And you're right ... if you created a system image while there was malware on your machine, the image will contain the malware. So don't use it.)
If the additional on-demand scans come back clean - well, it's up to you if you want to take that as a guranteed, 100% sure sign that the computer is malware free. It would really make me angry to find out a few days or weeks later than something escaped detection by all those scans and is now remotely controlling my machine or compromising my financial information.