Int change is perfect and I tell you why:
You dont go around swinging a sword with 50 str and doing 5x dmg, right? Don't expect to go around with 50 int and do slightly the same dmg than a mage with 120 is doing, because the difference wasn't noticeable.
Now there is a curve and it's linear and each point you invest costs.
And please, stop saying that fat mages got a 15% dmg increase: they didn't.
It's just that the int curve is fixed and now their dmg is consistent, unlike before.
You have all the data you need around, the int curve was clearly wrong before, it wasn't even a curve, it was a flat line from 50-120. If you all had that with Strength you wouldn't even be playing.