Good to have an update on how the swag went XB. I know what you mean about the high density foam mattresses included with most swags, some of them are just a tad too thin but a self-inflating mat is a good remedy anyway - albeit a bit pricey for a decent one.
I'm actually planning on rolling out my Oz-trail king single dome swag sometime this week, maybe next week at worst. This will be the first real test for the Oz-trail swag because I've only set it up at home so far. I don't know when I'll get to field test the Darche double though, I still haven't had the chance to get away thus far. The camp sites I'm planning on going to are accessible by foot only and I don't feel like carrying the heavier double swag, especially considering I am forever alone anyway
Happy camping.