Couple of things to check:
If you are not concerned with the space checks set the both to 100. This will negate these from impacting the archive as they will always be reached. Moving to the other three rules, mod time & access time & size; ensure that access times are not current as typically AV can set access time to a current date. REmember access time is not a default field in windows explorer so you will need to add it. If access time is not important you can set that threshold to 0. From there Mod and size requirements will need to be met accordingly, assuming you are use the "all" rule and not the "any" rule.