I missed this while I "took a few days off".
I'm Dual fan, so maybe I'm biased...they are usually very forgiving tracking wise. IF they are setup correctly. German engineering, they were sticklers for details. I find if the arm floats freely (in and out) and zero balances then you're good to go. Mine play some crazy wavy records and tracks through "skips" other tables I've had wouldn't. Cartridge compliance is sometimes an issue, but the Shure is a perfect choice for Duals.
If the V15 still has its stock or near replacement, 1.75 should be about right. If it's an eliptical or fine line, I wouldn't go much further. I ran a SAS on a M95 at 1.75 and it was too high for the suspension, it was much better at 1.25. Typically you can set the antiskate at or near the same value as downforce.