There is no question that your SP10 would benefit from some kind of isolation. Minus K has the advantage that it is mechanical and does not need a compressor. However, as was mentioned earlier, the load need to be centered and the unit needs to be properly sized for the load.
Albert porter uses a Vibraplane under his SP10 MK3 to great effect. You may want to PM him. I also use a Vibraplane for my suspended SME 30/12. The key with Vibraplane is to preload it as it is most effective if operating near its max. design load. The improvement for both my SME 10 and 30/12 was dramatic.
You might want to consider getting a large enough surface on either device so that you can also put the motor controller up on isolation. That too matters.
There is a recent review in which the Minus K was directly compared to a Vibraplane, and the guy preferred the Minus K, FWIW. Whichever device you decide to use, the supporting rack must be very solid and stable.
Albert porter uses a Vibraplane under his SP10 MK3 to great effect. You may want to PM him. I also use a Vibraplane for my suspended SME 30/12. The key with Vibraplane is to preload it as it is most effective if operating near its max. design load. The improvement for both my SME 10 and 30/12 was dramatic.
You might want to consider getting a large enough surface on either device so that you can also put the motor controller up on isolation. That too matters.
There is a recent review in which the Minus K was directly compared to a Vibraplane, and the guy preferred the Minus K, FWIW. Whichever device you decide to use, the supporting rack must be very solid and stable.