I measured net lift on only one set of Hughes rockers, and they were the older version that didn’t have the notch cut in the top.
They were 1.6’s.
With checking springs they calculated out at just under 1.6……like 1.58 or 1.59.
With 600lbs spring force they were barely over 1.50…….like 1.51.

I’ve never checked the TF specific HS rockers, but I have checked a few of the “normal” BBM sets.
Those checked closer to .05-.06 higher than the nominal ratio with checking springs, and still slightly higher than nominal with full spring force.

One set of 1.6’s on some Indy SR heads were 1.67 with checking springs, and still 1.63@.700 lift with 700lbs on it.