Hi Allen,
Thanks for your message!
You are right:
10% buy safe
0% sell safe
6% minimum buy amount calculated using stock value
5% minimum sell amount using stock value
total distance between buy price and sell price is roughly 20%
18% looking down, calculated from the sell price
22% looking up, calculated from the buy price
18+22=40 divided by 2 is roughly 20% for the distance from the buy price to the sell price.
20% is a nice number for ETFs to get some transactions.
Best, K