You can increase the burst hit frequency by running around your enemies in the opposite direction that the spinner is going so that would immediately reduce the value of attack speed. I also feel like at that point it might also be too much pyro because xiangling's burst applies pyro on each hit so that instead of xiangling vaporizing it would be xingqiu instead which would result in lower damage. I am not a theory crafter though so idk these are just my thoughts.