'A verdict may be set aside and new trial ordered 'when the verdict is against the clear weight of the evidence, or is based upon evidence which is false, or will result in a clear miscarriage of justice.'' Phav v. Trueblood, Inc., 915 F.2d 764, 766 (1st Cir. 1990) (quoting Torres-Troche v. Municipality of Yauco, 873 F.2d 499 (1st Cir. 1989)); see Fed. R. Civ. P. 59(a); Sanchez v. Puerto Rico Oil Co., 37 F.3d 712, 717 (1st Cir. 1994). In reaching its decision, 'the district court has broad legal authority to determine whether or not a jury's verdict is against the 'clear weight of the evidence.'' Vda. de Perez, 910 F.2d at 1006. Nonetheless, 'the trial judge's discretion, although great, must be exercised with due regard to the rights of both parties to have questions which are fairly open resolved finally by the jury at a single trial.' Coffran v. Hitchcock Clinic, Inc., 683 F.2d 5, 6 (1st Cir.), cert. denied, 459 U.S. 1087, 74 L. Ed. 2d 933, 103 S. Ct. 571 (1982); see Kearns v. Keystone Shipping Co., 863 F.2d 177, 178-79 (1st Cir. 1988). Thus, the district court judge 'cannot displace ...