I like to see the numbers you put there.
When diff is at 17.5T every TH will be making about 0.32$ a day (assuming btc price is static) , so for someone in EU who pays 15 cents and is running say an S9 at 93w/th they will be forced to shut down, this is why I said "it is DIFFERENT for everyone" because everyone's profit margin is different, some people are affected by 10% increase in price or 15% drop in price, others are still in the safe zone even with 100% increase in difficulty.
I am adding a few Antminer S19j Pro that will arrive in January and have a rate of .06. My goal is to have those paid off in 8 months after they are delivered and start mining. While I am expecting the difficulty to increase between now and then, I would hope that the price does as well. From what I can tell right now after electricity they are making about $35-40/day.
Does not seem like a bad plan at all, but, you are making a big mistake thinking your gear can mine for 1 year which isn't certain, also, the second point is that I see you use fiat values to determine ROI, to me, that's a bad business model, you need to consider ROI in
BTC, if you can't mine the same amount of BTC you can buy today + a good enough amount, then buying bitcoin now and not having to deal with all the mining process is a no brainer.
With that being said, 6 cents is pretty decent, your main issue will be the lifespan of your mining gears, if they can survive long enough, you will probably be in the green, also make sure you get a spare PSU, they are rare and expensive and have a bit of a high failure on all the 19 series, so buying 1-2 or two whenever they are available will be beneficial.