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There is alot to learn...slow, steady and simple is the way to learn more IMO. All the info, alot of it contradictory, can be very confusing.
Stick with the basics and give things time and observation to balance out before throwing a bunch of other stuff at a problem you might not be sure of the cause of.
Mixing grains(or anything else) with the crumble only makes them scatter the crumble all over trying to get at the grains and you don't know how much of what they are eating.
I put 2 scoops of crumble in the feeder every morning...I have determined, thru trial and error, that this is about what they will finish off in 24 hours. Sometimes I put a little more or a little less depending on what extra foods I have offered and/or due to fluctuations in the weather, they eat more in winter.
I scatter 1 scoop of scratch grain in the run in mid-late afternoon, a couple hours before they go to roost, to fill their crops for the night. I do this daily in the winter and less often in summer as other garden scraps are more available and there is less need for a 'hot' food late in the day.
The balanced crumble with the needed vitamins and minerals is their main food source, having it available all the time will keep them from gorging on it and make sure everyone gets a chance to feed on that throughout the day. I dole out the feed every day, instead of using a huge feeder filled once a week or what ever, to keep an eye on what's being consumed as well as anything else going on in the coop...but then my feed is stored in the coop so I don't have to haul anything daily except the half gallon to gallon of water they consume daily.
Oyster shell (mixed with rinsed, air dried and crushed chicken egg shells from kitchen use when available) is always available in a separate container to be used the the layers as they need it.
I assume the sand you are offering is for their grit needs? Sand is too small and rounded to work for digestive grit and it certainly shouldn't be mixed into their feed.
I don't provide grit as there is some crushed granite in the scratch feed I get from my local mill and they have access to the ground in the run.
Crushed granite grit could also be provided in a separate container for use when they need it.
Not sure why you want to measure by weight the food you are giving, maybe to see what the cost of producing your eggs is?
I keep track of eggs gathered and sold within the time frame that I use up one bag of crumble and approximately a half bag of scratch to see what those eggs cost me in feed and whether the egg sales cover the cost of feed. I set up a spreadsheet to do this. I don't calculate in the cost of bedding or oyster shells into the spreadsheet but know that those 2 items are pretty much covered by eggs sales also. After a year of keeping chickens I've found that the egg sales usually more than cover the cost of crumble and scratch, which was my goal.