The first on the list was the black hole. SG-1 managed to handle that while not being able to design let alone build a gate, the Aschen build their own gates and presumably have a better understanding of "failure modes" and could manage to disengage better than SG-1 did. If they survived the black hole (fairly likely I think) then they would almost certainly have used an "expendable gate" when testing the other addresses.
I also pointed out that the Aschen are more paranoid (reasonably so as they know how they treat other races and likely assume others will do the same) and might well test using a gate of their own construction in deep space, they do have starships after all, just slow ones. I think that they would ask themselves "If we had the suspicions that they had of us would we have handed a valid usable list over on the laptop or would the laptop have been a trap?" and assume a trap.
We know from the 2010 episode that they can handle the Goa'uld so linking to them would not be a problem.
The water world wasn't a threat to Earth just to the explorers, presumably the same applies to the Aschen.
The "Hot world" was only a problem for the team on the world, again no threat to the Achen and presumably they could build a cooling system if needed.