The logic behind it is this:
A spike indicates a very motivated buyer taking out the order book above. In order for them to move price, the order book has to be thin. Price sells off afterwards not because heavy sellers come in, but because the demand curve shifts back to the left once that demand spike is done from that buyer, dropping price as the supply curve can remain constant and demand curves slides down it, dropping price due to demand drop, not supply.
@TLAMB91 Can I ask which DA you are using? I think I need to try that yellow foam pad. Props to you though, detailing is some tough ass work and is a lot physically harder than you would think.