no, i've never seen single digits no matter what. but i'm 44, lazy, undisciplined, don't do cardio, with 3 kids, 4 dogs and I like to drink. I got to around 11% while not using keto though.
Yes, carb cycling can help a lot, but although many people swear by keto, there isn't a single scientific study that shows better muscle retention with keto vs a conventional diet. keto seems to work well for some mentally as they can still get in what would normally be "guilty pleasures" on the diet. 4 whole eggs plus 4 slices of bacon vs 8 egg whites and a cup of oatmeal. Which feels like a diet, which feels like a damn good breakfast?

but that doesn't make it more effective. But keep in mind carb cycling can be low days of 50-75g and high days of 150-200g. That would help with your strength/performance issues.
Also actually looking at your menu again, you understand that to truly be in keto, you need to keep protein relatively low and the rest of calories made up by fats? It looks like your diet is primarily proteins, and if they are too high your body converts the protein to glucose anyhow through gluconeogenesis. at 185, you probably should be no higher than 150g protein a day. And from your food list honestly if you are eating 250g protein, I don't see the 80-90g of fat to make what you say you get as daily total, unless its a lot of cheese.