[pmrphil]

Aubrey, it seems that you have discovered the problem (valve float/lack of control) and Alan has confirmed it also - a bit more spring pressure, a better (or lighter, if possible) valve, maybe a different type of spring, too? You say it's good to 7,000, but I'm wondering if with all the problems you are having if it's possible it's starting earlier and is not quite yet noticeable? Without a doubt, lack of valve control requires more spring to correct it. Good luck.