You have to take references (all references) with a bit of salt, and some thought. Akagi could do 28 knots (29 with a lotta push), but she was certainly capable of flying off VT sorties. Junyo could do 25 knots (26.2 with a push) and that's not far off. Most carrier ops took place in the 'trade' zones, with 20 - 30 knot consistent Easterly breezes, so wtfo? Driving into the trades puts 40 - 50 knots over the bow, and that's enuf to lift an F4U off a CVE. Beilieve me, Naval Officers knew, in thier heart of hearts, exactly what the nominal aero/hydronamic conditions were in their area of operations.
Junyo class has always been pissed on, for reasons I don't understand. Yeah, there were logistical issues, but this 'they were too slow' stuff just does not pass practical muster.