I would get a 1350 over a 1310. It’s stronger and only a bit more money. I haven’t heard great things about Adams. Maybe check out other options like JE Reel, or see if there’s a local driveline shop.
For caster, stock is 4.2 degrees. When you start lifting, you run into possible driveline vibrations if you keep the stock caster and have an aftermarket double cardan driveshaft. So it’s a balance between getting as close to stock caster as possible while avoiding vibrations. You can adjust caster with adjustable lower arms, adjustable upper arms, or both. Some people instead use control arm drop brackets. You say you have “front lowers.” I assume you mean adjustable arms. I’d try working with those before buying adjustable uppers.
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