We set power by EPR, on the Ground you pause at 1.40EPR and approx. 4000lb of fuel flow to check for surge bleed closure, in the air about 1.35 will hold 250 knots, all engine bleed corrections are applied to EPR settings, (except for min N1 with anti Ice on). As an old 727 driver I also use fuel flow as a target for power settings , after all its the same engine. Naturally, you keep scanning the other parameters, also keep an eye on the A/C Duct pressure if parameters don't line up as they should you may have uneven engine bleeds.