Could you give us a bit more information? Recipe, process, water report, does it taste sour?, did you use a starter, are you at your FG? ... there are a lot of reasons why it could smell sulfury and yeast is only one of them.
For example you could have used a different malt that requires longer boiling to boil of the DMS
So, if it is the yeast, don't worry just let it age out ( high sixties should do).
It might help to agitate the beer (shake or swirl the bucket, give it a GENTLE stir) be careful not to oxidize it tho.
To be honest you might have mixed the yeast. 05 needs to sit a bit longer than 04. 05 can take up to two weeks before the krausen drops.
If the sulfur smell dissipates, and you're almost at FG and the yeast still hasn't dropped out, rack to secondary, don't rack the krausen (captain obvious), lager at 55-60 if necessary.
I read something a couple of weeks ago on the probrewer forum and your post reminded me of it. I'll quote it here it was posted by the user "mmussen" if this helps you all credit goes to him.
Yeast tend to produce H2S during fermentation. Sulfur production tends to be inversely proportional to yeast growth. So if your yeast isn't growing enough (e.g. due to cold fermentation temps, high pitch rates or not oxygenating), you'll get more sulfur compounds.
Some copper tubing in the kettle is a very effective trick. I know several breweries that do that.
Another thought - particularly since you're saying the US-05 isn't dropping out like it normally does - you may want to add a yeast nutrient or another source of zinc to your wort. That may help the yeast along and help it drop out. I'd also suggest getting oxygen added to the wort somehow ASAP - on a larger scale batch the splashing doesn't add nearly as much O2 as it does in a smaller scale.
Otherwise maybe look at what you may be doing differently then the other breweries around, maybe there's something else going on
I don't really like cross posting from other forums but I think this might help you. It seems like professional brewers have the exact same issues as we do.