Less? Maaaybe. More importantly, stack 'em. Sure, Tsurugi only takes two stealth credits -- but three of them in one turn take 6. Make 'em have to bust through a whole bunch and risk going broke or running out of stealth creds. It's not guaranteed, but it's pretty effective.
Datasucker variant hurts that a touch, because can use suckers to replace some of the stealth creds -- even then, should be okay, but certainly not ideal. Definitely will require more ice on all centrals, though.
Might be time to consider running Neural Katana again, though, because it can't be run through (like Komainu) and while it dies harder to mimic, if you've got a predominantly stealth/switchblade focused meta, well, it's just as expensive to break as EITHER Komainu or Tsurugi, but is cheaper than either.
What Switchblade eats makes Mimic cry, but the reverse is definitely also true, I think.