What density percentage are reasonable?
Well, basically, keyword density is considered to be a rather old-school metrics. I can suggest to look at TF-IDF factor instead. Unlike keyword density, it doesn't just look at the number of times the term is used on the page; it also analyzes a larger set of pages and tries to determine how important this or that keyword is. Look for more info on the internet.
That's a little high in my opinion. I would always aim for 1.112342349673%I aim for 1.112342349674% , but on extreme circumstances go upto 1.33%
There is keyword density thing, I would say. Because among many keywords if 1 keyword is getting repeated lots of time, it triggers the SE crawlers and this is where keyword density thing comes into playthere is no keyword density, simply because there are many possible keywords on 1 page, not just 1 keyword, unless of course you are coming from the time machine.