LOST

My crossover settings are driving Me up a wall.My receiver ( Onkyo 701E)has a set of crossovers to adjust based on how large in diameter My main speakers woofers are.Now,My velodyne Cht-8 has Its own set of crossovers that I pressume must be set in accordance with the ones on the receiver.However,I'm still trying to find that happy medium of low-end bliss.You know,the one that kicks you in the chest and makes it feel like you have a lump in your troat.I've crawled for bass,I've spl set all my speakers,and I drive my subwoofers (one for front and one for rear)off the preamp jacks for front left/right and rear left/right.That way I thought I'd get true rear effect low-end and vice verse.So,have I made some mistakes along the way? I'm open to any and all help and suggestions.Please,I really need to get a good nights sleep.