So the Canis with UA is now a 5 HS to kill rather than 3 (167 * 1.2 = 200.4), which means it goes from ~0.238 seconds to kill to ~0.468 seconds to kill, pretty much doubling the TTK even with the spin up.

That's a (negligibly) longer TTK then the Gladius's bodyshot TTK at 0.459 seconds, assuming no nanoweave on a 1000hp planetman.