You sure you took enough? If you’re looking under your status and it says your at Painkillers [10], that’s not enough. You need to have your Speed Penalty from Painkillers be -10%. No, they don’t happen to be in sync. And no, I also don’t know why.
Also, protip; take some Adderall or Atomic Coffee (or a lot of similar stimulants). The Stimulants status boosts your INT, which dramatically increases your chance of success with Cybernetics because it affects all of the skills you use for it.