I just rebuilt the shocks on one of my SC10s with Kyosho grooved o rings and the white plastic spacer from the old AE rebuild kit. No leaks and no sticky o-rings. I think someone linked this here in the past:
http://www.shortbusracers.com/2011/0...shock-leaking/
FYI I built my B4.1 and the other SC10 shocks the same way, and I haven't had to rebuild them since April(ish).