I deny that increasing the number of physical copies increases the weight of an experience. If I create N copies of myself, there is still just one of me, plus N other agents running my decision-making algorithms. If I then merge all N copies back into myself, the resulting composite contains the utility of each copy weighted by 1/(N+1).

My feeling about the Boltzmann Brain is: I cheerfully admit that there is some chance that my experience has been produced by a random experience generator. However, in those cases, nothing I do matters anyway. Thus I don't give them any weight in my decision-making algorithm.

This solution still works correctly if the N copies of me have slightly different experiences and then forget them.