... Is there such thing as a flock that just gets along?
		
		
	 
Yes.
	
		
	
	
		
		
			Am I guaranteed to have troubles?
		
		
	 
I don't think so but you may have to make some changes.
	
		
	
	
		
		
			I would love to hear your experiences and thoughts before I might consider another flock.
		
		
	 
In all areas of life, I find it works better to stack the deck in my favor as much as I can rather than try to fix problems. Call it "stay ahead of the wave" or "build in wide margins" or...
One aspect of stacking the deck in favor of success is to provide enough space. The rule of thumb is to have a minimum of 4 sq ft of open floor space per chicken in the coop and 10 sq ft per chicken in the run. "Open" meaning not counting the space taken by nests, feeders, waterers, roosts that are lower than the birds are happy to walk under, anything else that takes up floor space. That is the bare minimum that has a reasonable chance of allowing most people to not see problems with their flock.
The shape of the space and the scale of the space matters. A narrow space or a space with choke points like doors has a higher minimum because one bird can block the others easily. A small flock needs a larger space as a minimum than a very large flock because they don't stay spaced evenly across the space. So, in a large flock, any given hen can show respect to any other given bird by getting far enough away or going behind others.
Another aspect is the characteristics of the chickens kept. Flighty birds tend to need more space than docile birds. Mixing types of birds, like flighty with docile or polish with clean feathered birds or easy-going types with less easy-going types tends to need more space as a minimum than birds that are all of a kind.
I started by keeping five, three black australorps and two brown leghorns, in a combined coop/run that had 8x10 feet of clear floor space. One of the leghorns behaved more typically for a leghorn than the other and was not a good fit for such a small space. I gave her to friends who free ranged nearly all the time. My others did much better after that. A year later, I lost one of the australorps to a reproductive problem. That was a harder loss for the others but after they adjusted, I could see that the three fit the space much better than the four did.
Other aspects have similar "bare minimum" vs "with margin" ranges.
It isn't that one necessarily has to have more space, or similar birds, and any of the other aspects. But if you don't then it takes more management, and/or luck, to not have problems.
I like you were unlucky to get one chick that discovered feather picking and the others learned it from her. I don't know how to fix that so that keeping any of this flock will be easy to keep. Your space is minimal, probably the other aspects have more margin.
I think if you started over with three or four birds of one breed or of very similar breeds or started over with five or more of one breed or very similar breeds in a bigger space or started over with breeds that were not similar in a much bigger space that you are much, much, much more likely to find chickens are easy to keep.