Which HH model has the flattest sleeping position?

[Darkale]

For a really flat lay, I found with my HH Expl UL that when I hang it loose (like, ridiculously loose, as in getting out and thinking "man, that's really saggin'", is when I actually laid the flattest. The Ridge Line was tight when I was in it, but not guitar string tight.
YMMV

Isn't the DJ XL same size as the EXPL & EXPL UL?