I use Purina Flock Raiser because I can get it consistently with fresh mill dates in my location for about $18/50# bag.
Purina actually own Nature Wise and makes the feed for Dumor.. in addition to many other brands I probably know nothing about. They are a multi conglomerate who I have zero brand loyalty to and if available might choose something made by Kalmbach instead.. that feed smelled SO good! But it is a regional feed I found on Amazon once and not available to me on a regular basis. Have you already checked out or seen the feed comparisons brought by 
@Kiki? If you don't see the one you're using, consider sending her the info.. The offerings I get with satisfactory turnover to keep mill dates fresh are very limited really. Back when I started my hunt and spent hours upon hours in feed store after feed store this wealth of information hadn't yet been so diligently brought together in one location..
https://www.backyardchickens.com/threads/➡-feed-comparison-spreadsheet.1275920/#post-20524932
I wonder if she's got them set up for other countries than the US? 
 
I avoid Purina dog food like Benefuls and other as I don't find them to be acceptable...
No matter the company name.. they all make cruddy cheaper products, that serve the purpose of some folks well enough, and I have been one of them. Now at this point in my life, I'm a label reader.. ingredients, nutritional analysis, etc. Even then... I'm buying what is a
 happy medium for my current budget, my animal needs, current location availability, etc. and not my dream perfection. While I don't buy ALL the hype about non gmo OR organic, I do find some validity in the cleanest most chemical free life possible, and figuring out what the natives knew.. recognizing that I'm not keeping a natural amount of birds in my space.. what some folks are calling self sustaining is really just self propagating and when crud hits the fan and feed isn't available (like for some during Covid), watch our flock sizes and types and consumption change.. you don't see fat fluffy birds in regions that are less developed and truly relying on their land a bit more. Not judging, just saying.
I have seen them online up to 22% protein (shown in some studies to give the best hatch rates) and still 4%+ calcium.. the added calcium is what makes it "layer" feed. I have not YET seen layer feed above 16% available at any of the feed stores in MY location.
But you are correct.. "layer" is just a term indicating who it is meant for and not indicative of the actual nutritional analysis. If one wants to know they must read the labels.
I'm sure I've said it before but not all protein is created equal.
@Jackiebjackie once your getting eggs, will try and remember to report back whether you find any fishy taste.. thinking fish was an ingredient in your feed and that had been one drawback mentioned.. as a possibility.