As suggested by my colleague Asif, you can modify the prconfig.xml. Also, how are you trying to import the zip file?
I mean there are various ways in which this can be achieved.We can make use of System Management API for that purpose. Also, we can import using prpcServiceUtils.properties or you can directly use prpcUtils.properties(which will directly operate on Database) from Command LIne. Please refer
If you are using prpcutils successfully for PEGA7.3 version deployments , can you please give the properties file that you are using and also let me know if you did any changes in any file in prpcutils, I will try comparing your template, because my deployments are filing randomly.