Here's a size/weight chart for Cabelas Duo-Lock snap swivels.
I know what KF means by some swivels being to hard to open, especially the smaller ones.
I like this type, they seem easier to open for me.
I don't know if there more prone to opening under load than the other type, but I've never had an issue.
In their print catalog they have a picture size chart to give you a better idea.

As you can see, you have 4 choices at the # 25 rating.
?, Can you tie a loop in one end of that titanium wire and hook into a quality snap swivel on your main line.

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DUO-LOCK CHART

14: 15 lbs
12: 15 lbs
10: 20 lbs
8: 25 lbs
7: 25 lbs
6: 25 lbs
5: 25 lbs
3: 50 lbs
1: 55 lbs
2/0: 70 lbs
5/0: 100 lbs