With a 4.2 ratio lever, stock intermediate servo with sonnax o-ring sealed cover, stock 9 spring setup, stock apply piston, (2) added 1/8" feed holes, kevlar flex band, and (6) clutch flat retainer with .050" clearance, and 200-215 psi line pressure, my 47rh has perfect shift timing on the 2-3 shift with no modifications to the case whatsoever. Both the band and the direct clutch are wearing normally and holding up fine. I don't have a fancy accelerometer to check for bind-up but my seat of the pants meter feels crisp, firm shifts.
All that said, your results may vary!!!!!!
Most of the guys with bind-up issues are running upgraded aftermarket intermediate servos with better seals. These bigger servos are slower to release, compound that with an odd ball 4.4 or hemi 5.0 ratio lever and bind-up is real possibility.
I really like the 4.2 ratio lever with stock servo and upgraded cover. In my opinion, when line pressure starts hovering in the 200 psi range, there is no need for a larger servo and radical ratio lever, all that does is risk case breakage from too much force.