I'm using one of the knock off 30 series drivers, and would like like it to engage a little earlier. I have to feather the throttle just to take off easy and most of the time it when it engages, it's faster than I'm used to. I know that Comet offers several springs for different engagement rpm's, but I don't know which one would suit me. The spring in it now has no color...anybody got an idea what rpm these engage at? Can anyone that's using genuine Comet parts tell me what you're using?