I'm usually a C2 sort of guy, but through bad luck and (my own) poor performance, I've begun my Sunday morning with a B1. Whilst a bad start to the day, I'm determined not to let it ruin what could be a good Sunday.
A=>D is decreasing milk amount, and 1=>4 is increasing strength, so D1 would essentially be water, A1 would essentially be milk and the B3/B4/C3/C4 would be the square of "not pulling a face when you take the first sip" (although I lie somewhere between B4 & C3 so I may be biased)
I've found that a longer steep doesn't really make a better cup though. If I want stronger, I add more tea and stay at the 4-5 minute range. Past maybe five minutes, it's getting tannins at such a high level that it's just bitterness. Which, if you like your tea very bitter, that's a good thing! I prefer the more subtle flavors over the tannic bite, though.
Ahhhh, gotcha. I'm sorta the same way with coffee sometimes. Grew up with basic folgers rotgut, so I get that hankering for the way coffee tasted as a young'n rather than it tasting the way I usually prefer it. So I'll just dump too much into a percolator, keep the heat on it until it's near scorched, and let it eat a hole in my belly lol