My diet is light on carbs and has plenty of protein. I don’t think I’m deficient.
Four chicken breasts would be something like a pound and a half of meat. That seems excessive.
In OP, they say "Protein target: ~0.54–0.73 grams per pound of body weight per day". Given that an average male weighs 200lbs in the US[1], we're looking for 108-146g protein/day. If your protein only comes from chicken breasts, and given that an average (52g) chicken breast has 16g of protein[2], you'd have to eat 8 chicken breasts per day to fulfill those requirements. Factoring in your other meat (something with lunch, and a bit from other sources like cheese), if you skip meat in your breakfast, yeah, you'd need like four with dinner to hit targets.
Your diet is your business of course, but I'd consider tracking your diet for a few days to see how the numbers add up.
[1] https://www.cdc.gov/nchs/fastats/body-measurements.htm
[2] values for "1 unit", whatever that is: https://fdc.nal.usda.gov/food-details/171477/nutrients
I hope your numbers were more accurate when you determined you were struggling with hitting targets....
No, I bought a kitchen scale and did everything by weight, it seemed like the only sensical solution. This is probably a good time to plug Cronometer! I'm not affiliated, just been a happy paying customer for a few years now. https://cronometer.com/