You want something comfortable for you with a little flexibility- Hybrid 1.7 mountain.
You want something with a little extra umph for all your possibilities- Hex 70.
Double layer is not needed- about the only real reason to get it is if your dog is a turd and likely to damage the hammock.
You are a bit torn... you're about the right weight to sit on that edge but if you hadn't listed all the other 'optional cargo' I'd say 1.7 all day.
You'll find the Hex 70 a bit stiff in personal use but it will cover you all the way up to all your various loading scenarios in a single layer.
You'll find the Hybrid 1.7 perhaps a tad firm if you like a soft bed (I am 230) but when my kid crawls in too I don't need to freak out. I have some customers who sleep with their dogs and the Hybrid does pretty well.
When I'm at a family thing or kids are around- I set up a Hex 70 and let them go nuts. They can goof in there and do whatever with out me flinching It's a pretty bomber material.
So... mainly you need to pull the trigger on what you realistically think will happen.
You and a tame/obedient/nail trimmed dog with a few pieces of crap stuffed in there with you- probably fine either way.
You, a friend, your dog, a cooler of beer, whatever... Hex 70 or double of whatever.
Really storing gear in the hammock itself is rarely comfortable. If it's hanging on the ridgeline it's not loading the fabric... something I think some folks don't think about.
Some spare clothes and a pound or three of personal items aren't the straw that breaks the camels back... and trying to store your pack or other heavy stuff inside generally sucks.
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