If it's purely a problem of the ess sound being too prominent and everything else being okay, then moving the mic won't help. For this it's either change the performance or use frequency-specific dynamic processing.
If the whole sound of the voice is too bright then moving the mic, using a different mic, or using eq, can help.
If it's a problem of the esses blowing into the mic causing a rumbling sound, then moving the mic or using a pop screen can help.
Which one of those scenarios is the case?