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I don't understand your comment. Based on the datasheet:
LJ12A3-8-Z/BX
Detection distance 4mm

LJ18A3-8-Z/EX
Detection distance 8mm

What tests are you referencing? If you plan to use glass over the heated bed for example the 18A3 is definetly the way to go.
Do you have a link or a reference to the tests? Maybe I understand the problem wrong on my side.
Thanks.
George