[Chris Doughty]

I think I disagree with your commend on drag and sealing benefits.

for sure, lower number is softer.

but here is now I have found it to work.

because all the o-rings are compressed in the shock seal 'cartridge' I have found that the softer o-rings resist this compression far less. results in less drag on the shock shaft but is more likely to weap some oil.

the stiff o-rings offer more resistence when they are 'squashed' into the shock seal 'cartridge'. this is more pressure on the shock shaft and more drag on the shock shaft.

I personally use the blue (softest) shock seals, after a few runs all o-rings swell up a little bit and provide a better seal than when first installed.
I don't really worry or think about having to re-fill my oil, I don't have any air in my shocks, the only time I'd consider an oil change is for a setup change that I wanted to make.

the stock red o-rings are 70 shore rating and they have quite a lot of drag on the shock shafts.