Vibration Theory - Isolate or Drain?

I use OHAUS brass weights on top of all 4 players in my system. The weights are 20g(2),50g(1),100g(1). For what ever reason the brass weights work best in my system on the front right(3 players) and front left(1 player) of the units. One odd finding is that on all 4 players they work best on the front opposite side of the units power cord. Example: 3 of my players have power cords on the back left of the unit. On those players the brass weights sound best on the front right. It is just the opposite with the one player that has the power cord on the back right of the player. The brass weight sounds best on the front left. Don't know if this just a coincidence. But it is consistent with all my players. I know what some of you are thinking, what would happen if my power cord was dead center in the back of my unit, would it go both ways?

I have 4 players in my set-up. So from the player down this is the order they are in. I place all 4 players with there stock feet on a 15x20x2in thick Maple cutting board. I then put 3 roller bloc Jr. under the cutting board, two in the front one in the back center position. The roller bloc Jr. sit on top of another Maple cutting board the same size. This second maple cutting board sit on top of 3 rubber/cork squares like the one Mapleshade sell. The rubber/cork squares are place 1 in front center position and two in the back on my equipment rack shelve. I have two racks and both speakers that I use this 2 maple platform on. I removed the 1/4 20 brass spikes that came with the speakers and replaced them Audio-Point brass spikes which were an improvement. The real jump came when I replaced the Audio-Points with the 1/2 inch grade 25 Tungsten Carbide ball, which fit perfectly in the hole left by removing the spike cones. That was over 6 years ago. I have not looked back since. And as of today, I don't have 1 cone or spike in my system. It is MY belief that Tungsten Carbide ball work better than spikes when using the maple cutting boards. Please remember this is just MY opinion base on my fooling around with spikes ,cones and metal balls for 7yrs in my system only.