I'm glad you like those girls. Sometimes when I put Abi back in the rack, I'll pull her back out to take another look. Don't know what it is about that pet store normal.
I didn't raise the temps gradually. I just pulled them from the their cold storage, put them in a clean tub, and threw them in the running racks.
The physiological aspects of brumation occur automatically when the temps are sufficiently low. It they're at 60* or lower, they're brumating. But brumation doesn't mean that their 100% asleep, 100% of the time. I see them active at times even at low temps, and they see me and respond. If I handle one while I'm changing its water, it's usually almost as active as normal, with only a hint of sluggishness. So no, you can't tell by looking that they're in bru, but if your temps are low enough, they're in bru.
I give them four or five days at normal corn temps (75 cool, 85 warm) before I feed them a smaller-than-normal meal. Then I feed the males normally (if and when they'll accept), and the females aggressively.
If I couldn't get satisfactory brumation temps, I'd probably find the coolest place you can in the house and deprive them of food and light for five weeks. Of course, the snake has to be of healthy weight going in, because they're definitely going to burn calories when the temps are above 70* (or even lower).
Hope this helps.