There are two methods to setup default project.
1. add entry in file /etc/user_attr for example:

Code:

gregory::::project=projectname

2. create project with a special name for example:
-user.gregory (this creates project which is default for user gregory)
-group.staff (this creates project which is default for group staff)

For details see:

Code:

man getdefaultproj

What resource limit you want to increase? Does your process need more cpu, memory, or something else? Have you check this with some stats command?