Should torque management be removed or just reduced?

Reduced is the safer default on a stock transmission.

What torque management does: it limits how much engine torque reaches the transmission, especially during shifts, to protect it (HP Tuners).

What tuners change — per Gears Magazine, looking at tunes on GM 6-speed automatics:

• Shift torque reduction: stock calibrations use a torque factor of 1.0; tuners lower it (0.7, for example), so less torque is pulled during the shift and more goes through the clutches.
• Stall torque management: often disabled by raising its enable rpm out of reach.
• Line pressure and shift times: tuners add shift pressure and shorten desired shift times to firm the shifts up.

The cost: the internals then see more torque than stock, which raises the risk of clutch slip and overheating unless the transmission is upgraded. HP Tuners' own warning on these tables: changing or disabling them can shorten transmission life or damage it.

In practice: the more power you add without upgrading the transmission, the more that protection matters. See transmission tuning.

Want to do it yourself? See who tunes it, and how to learn.