Well since old UE weapons have disappeared for the remainder of this year, I have found that guardian weapons are the strongest F2P weapons that are currently accessible. If we are making a grid solely out of guardian weapons, wind has the best one with a Bethor glaive grid with 5 Bethor glaives, a phantom glaive, and 3 Bethor bows for exceed. Given, I didn't really consider the pool of event MLBs and FLBs, so that could change the order around a bit.