Correct spoke tension for DT Swiss EX 471 26" 32h rim paired with Wheelsmith DB 14 spokes
I believe DT has a blanket recommendation of 1200Nm for all their rims, or 122 kg-f. You could email them to corroborate but that number should be safe.

Use the tensiometer chart for the thin section of your spokes. By the same token, always position the tensiometer such that you're isolating a thin segment for measurement. If you had any of the thick section in there, the spoke would deflect differently and the measurement would be useless. Wheelsmith spokes have long butted sections with very short transitions, which makes it easy. DT spokes are the opposite, making tensiometer position fiddly at times.