I'm sorry that you are realizing what I discovered spending my spare time on BYC--the older the hen, the fewer the eggs. Also, in MY experience, two breeds lay very well: RIR's and EE's. Now, I realize that other breeds lay very well, too.
I have a friend who's GF decided to buy baby chicks around Easter, even though her neighborhood has a convenant against chicken keeping, so she broke the rules. She's been keeping them in her garage, but wasn't sure about the "crowing". I ended up with 3 bantam roosters, 1 Silkie, and two Australorps (?), still not sure. The last three are hens, but the Silkie is gonna be on the dinner table tonight along with the three bantams.
To me, these 4 birds are useless. Silkies lay one egg/week, if you are Lucky. They are bred for showing.
Regarding adding light in the winter, it does work. Remember that chickens originated in SE China, close to the the equator, where the winter days are not too much shorter than 12 hours/day, and the summer days are not much MORE than 12 hours/day.
I had a 75 watt light on a timer this winter, flipping on at 5AM-8AM, and then again 5PM-8PM. My 6 hens laid faithfully all winter 4-6 eggs/day. I know on FB there is the normal exaggerating, but I really did get a good amount of laying, and my hens are 2yo's.
Still, these hens will be going to "freezer camp" this winter, and they will be replaced. I will harvest them after their molt. I have discovered that they skin the best at that time, BUT, each one will have to be cooked in a crock pot, with a cup of wine. I just salt the inside cavity, add a few leaves of sage, and 1/2 of an onion, salt and pepper the outside. The wine or beer, breaks down the meat, and you cook on LOW 6-7 hours. Then, the meat is tender.
Chickens are just tougher after one year. The birds in the grocery store are under one year old. The birds in the grocery store eat...???? I have come to believe that those birds are mostly ill kept and fed, perhaps, some kind of garbage mixed with sawdust, bc I have read articles in the past suggesting this could keep the costs low. MY birds eat the cheapest name brand farm supply store layer feed I can get, but my horses and dogs approve of it, so it must be pretty healthy.

They also get grass, and sweet pepper tops, and lettuce that's gone brown, and carrot tops--You get the picture.
It's fine and nice to keep your birds as pets.
It's also fine to harvest eggs and meat from them.
I now feed dogs, cats, horses and chickens and it ALL costs me. (Horses are on full pasture now, so hay costs are reduced.) Every animal at my place has a purpose. My chickens live a good life.
Sorry that you are at a crossroads.
