Trigger Troubles

I'm having some strange issues with a trigger and I'm hoping someone can help me sort them out.

First things first, here's the script I'm using to make the trigger.

// Make the bounding trigger
    %trigger = new t2dTrigger() { scenegraph = N9_01SceneGraph; };
    %trigger.setDebugOn(BIT(0));
    %trigger.setPosition( %location );
    %trigger.setSize( 120 120 );
    %trigger.tag = "eBase";
    %trigger.enterCallback = 1;
    %trigger.stayCallback = 1;
    %trigger.leaveCallback = 0;

Then to execute my enemy spawning.

function t2dTrigger::onEnter(%this, %object)
{
   echo("Enter:" @ %this.tag SPC %object.tag);
       
    switch$( %object.tag )
    {
        // Player enters in trigger
        case "player":
            if ( %object.tag $= "player" )
                schedule( 500, 0, "CreateEnemy", $eBase.getPosition, 225 );
            else if ( %object.tag !$= "player" )
                return;
    }

}

function t2dTrigger::onStay(%this, %object)
{
    echo("Stay:" @ %this.tag SPC %object.tag);
}

function t2dTrigger::onLeave(%this, %object)
{
   echo("Leave:" @ %this.tag SPC %object.tag);
}

So, here are my issues:

1) The onEnter message does't always come when I cross the border, sometimes it's a few seconds after. Sometimes, the onLeave message echos right after the onEnter, even though I'm still in the trigger.

2) The onStay message never echoes, which is a real drag because that's where I really want the function to be.

3) Assuming I can get it to work in the onStay callback, how often does it check to see if the player is still there? Ideally, I'd like to have a set quantity of enemies in the base so it does run out, which I can do with a counter, but I don't want them all to dump at once because the callback fired at the same frequency as say, onSceneUpdate.

4) *edit* Got this one. Was a misplaced function bracket.

Any thoughts on these issues?

Thanks,
Don