You keep on top of scans which is good:)
If using Mbam weekly, drop Sas.
Mbam is good enough in that dept.
Running scanner while Eset is active will slow process down but whilst scan is running, if Mbam dosn't detect a "bad" file, if its in Eset's signatures/heuristics etc...., it will be brought to its attention and dealth with.
Have a look at Hitmanpro to run as well. Scans very quickly.
Once activated(not needed until removal of malware), you then have 30days of removal. After that, no removal(unless purchased), but you can still scan.
http://www.surfright.nl/en/hitmanpro