Isotopes used for carbon dating
Very good scientists listen to their inner crackpot but keep it inside until they are very sure that their inner crackpot has revealed something new.Not so good scientists regularly expose their inner crackpot for the whole world to see.And yet we know that "radiocarbon is forming 28-37% faster than it is decaying," which means it hasn't yet reached equilibrium, which means the ratio is higher today than it was in the unobservable past.
We have to assume, for example, that the rate of decay (that is, a 5,730 year half-life) has remained constant throughout the unobservable past.
So the net effect on archeological dating would be null even if these variations existed.
Secondly, these purported variations are very dubious.
Specimens which lived and died during a period of intense volcanism would appear older than they really are if they were dated using this technique.
The ratio can further be affected by C-14 production rates in the atmosphere, which in turn is affected by the amount of cosmic rays penetrating the earth's atmosphere.