I don't think the speed increases for the ships are calculating accurately. After building a Kinetic Rune Factory, it seems to be making my ship speed slower and not faster. Same thing when you get a sail speed bonus level... it increases the time it takes to speed up.
This was noted when I built a single Rune Factory and used the Adv. Galley to see that max workers would allow a 6 hr 32 min return time for a 3D/8H journey. Built a second KRF and same ship with max workers with same 3D/8H journey would be be 7H 52M.
What the hell?
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