It can be fiddly getting things to spawn, with one little thing off ruining the efforts. Make certain the Mission date itself up top in the text of the mis file header is correct. Make certain the GameEntryDate is far enough past the intended date of use of the mis file, make certain the GameAvailabilityDate is far enough forward of the intended date of use of the mis file, and that the CfgDate matches that AvailabilityDate. If testing in a SingleMission, be sure you are using a Start Date for that which incorporates all of the above. If doing it in the Campaign, be sure the Flotillas and PatrolObjectives assignment dates cover the intended period properly. The holds true if it assigned in the DynamicMiss cfg file. Any one of those three can also upset the intended "balance" that you're after in the mis file...
