Permgen, webtest, IntelliJ

Hi. 
I was on this list about 4 years ago, so greetings to some old timers
I just ran install-plugin webtest on an existing grails project under IntelliJ. 
It didnt run up out of the box unfortunately and I've had to change a few settings to get it to run a one-trick test from the command line. It still doesn't run in IntelliJ. 
The key problem I'm stuck on now is permgen.  In IntelliJ it gets halfway through and dies on permgen. At the command line it will run one test ok, but I've just added a second class with a single test and ... Permgen. 
So I've read the searches and yes they all say to set the 

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