First, unless your Sondek is sitting on a very heavy piece of furniture rather than a dedicated support(preferably of low mass/high rigidity as per Linn recommendations) you should ditch the Trampolin and return to the stock base.
The improvement to focus,pace,timing,etc will be nearly half of the benefit of upgrading to Cirkus or Lingo.
Further gains can be had by leaving the lossy bottom cover off entirely and improvising new attachment points for the original Linn hard rubber feet with triangular pieces of Duron.
The downside is that this tweek exposes lethal voltages of the Valhalla board to the clumsy or curious.
A simple fabric cover could be fabricated to somewhat restrict accidental electrocution,tho.
Best,
Ken
