Those don't increase combat speed for suppressor. If you want a speed boost, use Fearless Blitzers, Gearheads, Silent Hunters, or Remote Raiders. The 30% speed boost Remote Raiders give you doesn't wear out, but is only 30%, not double. Silent Hunters is only a 5% boost, but doesn't wear out either.
When looking at rogue crews everything under the "Favored Ship" line of text only applies to the the listed ship.For the Wolfpack, the combat speed is part of the favored ship stats and only applies to the Sea Wolf.Suppressors will only receive the 14% crit hit chance for missiles.