I do too, Wallace is a fabulous resource. But even Wallace can disagree with himself. For example, Wallace 1/8 to 1/4 says op's 6.573 is 10.45, but if you plug in ideal for 106.23, he says it could go 10.teens.
The other methods I use....
Nhra uses ÷.64
Others use x1.57
Can also use x1.58
I also have a chart bookmarked on my phone.
Last is maybe the best, as it is adjustable, if you have a good slip with 1/8 and 1/4 on it. 1/8 + .22= ? Then ÷.655
If you need to, the.22 constant can be adjusted to work best for your own car. .24 or .25 was accurate for my cars.
Driving takes practice. If you are doing bracket racing... Lots of practice to learn both the starting line and the finish line. If you made a big jump in performance, the comfort should come fairly quickly.