I have a G30 also. Next time you brew fill the malt pipe with your grain and slowly lower it into the water. Let it sit a couple of minutes and recirculate slowly at first to set the grain bed
I saw them in San Diego 1978, they did blow out Black Sabbath. Actually Black Sabbath got booed, they deserved it, they sucked.
Didn’t hear of much of Van Halen before but thought they were great