I don't really see why men and women would need the same amount of Power to reach the same outcome. Maybe it's like carrying water in a bucket: the stronger person carries more but slushes it all over the place, the more dexterous person carries less but ends up with the same amount of water in the end. Maybe a fireball of Saidar needs less OP to make than a fireball of Saidin? And then there were some things that men simply could not do as well, like make a bridge of Air (and presumably something that women cannot do as well).
Don't see why men and women would need the same amount of Power to Travel. Totally different weaves and all.
It's the characters IU, including female "loath to admit shortcomings" Fosaken from an Age with plenty of both, that refer to men as making the better weapons, and even just the fact that Red's work in groups to take down untrained men says a ton. Our main first hand example is the small sample of the Forsaken and Rand, true, but men just seem more capable of do large area of effect attack weaves. The "just pump a ton of Power into them" kind of weaves.
As to Traveling... Responding to "a greater percentage of Ashaman seem strong enough to Travel" with "maybe the female weave doesn't need as much Power"... Would only paint the women as being even weaker, as the issue is so many of them not being able to use it without linking.
Which mind, is the real reason as likely as not. Just another balance thing. women can link, so can get by with having fewer strong enough to Travel on their own. Men can't, so a greater percentage of Ashaman have to be able to do it, or they'd be at a huge disadvantage against the female channelers.