I absolutely do not see the reason for any of this in terms of balance, really. I'm already a Veela Veela archer so I have considerable STR and high DEX. It's not like I'm a wheelchair mounted archer with 80 DEX and that that is the reason why I oppose this. This wouldn't harm my character really. I just see no need to "balance" this. I picked the higher DEX cause I like a bit more foot speed when I'm not on a mount. I didn't need "less sway" to make that choice.
You also know then, as a Veela archer, that any Thursar/Ogh/etc can hit harder than you with a bow. Why is the race with 3 clade gifts for bows/archery, one of the worst at archery?
I think part of the idea here though is to also give Dex some meaning. In its current form, it's a dump stat by most builds, and lacks the same potency as other stats. Since movement speed is pretty negligible across races, where is the value in a high dex alvarin that has a much smaller Strength ceiling?