Vibraplane: Should it be loaded close to limit?

Dear Peterayer, any vibration isolation platform does only work at its best when operated as close as possible to its maximum payload.
Right now your Vibraplane doesn't work at all.
You should consider adding a very heavy grantie or similar load plate underneath your SME to get close to the payload maximum of your VP.
When you look up the technical specifications of the 2210 on Kinetics website, you'll see how the resonance frequency is related to the payload.
For some insight you might contact Audiogoners Syntax or Solong.
Both do operate the 2210 since years and have fine-tuned their VPs payload over the period and with telling results.
Cheers,
D.

Sure you can work w/o extra weight.
And it still does some good for your sound.
If you're satisfied with 60% performance - than you are fine.
If you want the full benefit from your Vibraplane (read: lowest possible resonance frequency - as this is what the complete vibration isolation issue is all about), you will have to go as close to the maximum payload as possible.
Sorry - not my idea, but physic.
You may ask Audiogoner's Syntax or Solong about their journey with standard Vibraplane and then with added weight till maximum payload was approached.
They will tell you that you just can't argue with physic and how much the sonics - especially in the low and lowest registers improved.
Cheers,
D.

Palasr, do get in touch with Solong - he too has some history with leaking Vibraplane tubing/ feet. I'm sure he can give some hints which might spare you part of search/repeated tries.
Good luck,
D.