If you have a spot on the back of your riser sop that you could put counter balance stabilizer then yes you need the rear mount but if you don't have a spot to screw it into on the back then you'll need the fromy mounted one .I don't think the STS will correct that part ,it's either your form could be off, or your draw length is too long . Are you sure that the draw length is correct ,double check it to make sure .As for your form try to turn your body away from the bow just a bit and don't stand so square to your bow while shooting and see if this help's .The STS is meant to cut down on string vibration's ,not wrist slap or inconsistant shooting .

nubo