If you can't re-record a better take, put the de-esser away if it's not working, solo your vocal track, expand the wave form vertically and horizontally until it's approximately huge, and automate a volume cut (a simple V works most times for me, but if it's a long S sound you might need to have a reverse plateau shape) of 5 db over the sibiliance..., then unsolo your vocal track and listen - see what you think, and adjust if you need to.
Or in the "singing technique" forum.
The first step is to get some perspective and make sure that it's actually an issue. I think a lot of people have the instinct to go a bit overboard with anti-sibilance treatment, and the OP saying "get rid of..." really worries me. We tend to get all blindered and nitpicky sometimes, and on top of that a lot of the lower end speakers can be a bit hyped or harsh right in that sss area, and this can be exacerbated by problems in the room itself.
My monitors are notoriously unforgiving in the region that makes sibilance really hurt, and I struggled on my last album up to the mastering stage. Eventually I convinced myself that some really great sounding mixes that I know quite well were coming across a bit harsh also. So, like, try that real quick. Listen to some other stuff in the same general genre that you really like on your system, and try to be as critical of their mix as your own. Or try listening on a number of other systems just to make sure that it's not just your speakers/room.
Yes... don't try it in the mastering stage... it's a tracking / mixing issue.
If you can't re-record a better take, put the de-esser away if it's not working, solo your vocal track, expand the wave form vertically and horizontally until it's approximately huge, and automate a volume cut (a simple V works most times for me, but if it's a long S sound you might need to have a reverse plateau shape) of 5 db over the sibiliance..., then unsolo your vocal track and listen - see what you think, and adjust if you need to.
You'll get pretty good at working out the exact length and depth of your cut - I can pretty much do them all in a single play through as long as it's not a particularly essy set of lyrics.
Works better for me than any de-esser I've found in the "free" range... YMMV...
No magic bullets, sorry, we're out of stock. Work required instead...