Re: Sonor Perfect Balance not sitting flat on ground...
You might have to loosen your bass drum spurs and experiment where the pedal will sit flat when you tighten the clamp down. I tend to have to do that with every new pedal I try. I put the pedal on the ground, slip the bass drum into the clamp area without tightening it down, then adjust the spur height to accommodate the pedal. Sometimes guys like their bass drums tilted upwards and this can really affect the connection of the pedal. Sometimes I find the bass drum is actually straight with the floor after I adjust stuff.