If you could confine the field to the cabin you could, in theory, make everyone feel weightless, but the energy density required is still astronomical. In practice you’d need a power source that dwarfs the ship’s mass or you’ll get a tiny residual pull. The only real shortcut is exotic matter, which we don’t have yet.

First, get a precise field map of the cabin and compare it with the theoretical profile. If you can confine the gradient so that the field drops off at the walls, you’ll keep the mass‑energy density low. Next, run a series of simulations that include thermal loss and the power drawn by the coils, then tweak the coil geometry to hit the sweet spot where the magnetic pressure equals the cabin mass per unit volume. Finally, add an active feedback loop to keep the field steady against any disturbance—then you’ll have a weightless pool that still fits in the power budget.

Sure, trim the coil windings by a nanometer or two, re‑align the windings for tighter packing, and use a higher‑conductivity alloy to reduce resistive losses. That will shave off a bit of heat, but you’ll still need a tight thermal margin; otherwise the coils will run hot before you hit the target field strength. Just keep the adjustments incremental and double‑check the field profile each time.