What about humans? They stay at +1 to all? Or do you only allow human variant ?
If you only give +2 +1 to human standard you nerf them a bit for certain builds.
Btw no player is gimped by a +1 difference in an attribute score. At +2 you can start complaining. Anyhow if everything is balanced out over the races you can set any threshold you want, but do not forget to give standard humans 2x the asi of the other classes, e.g. you reduce it to +1 then standard human should get 2x +1 or 1x +2, If you say I want more and give other races a +2 x 3 times then standard human should have +2 for each attribute.