By Frankie Taddeo Best bets for Week 5 USFL action, plus updated future odds. USFL Betting TrendsThrough four weeks of action on the gridiron in the USFL, we find only one undefeated team (Birmingham) and two teams above the .500 mark (New Jersey and Tampa Bay). After seeing underdogs dominate the betting outcomes in Week 3, USFL favorites returned to their winning ways In Week 4 posting a 3-1 straight-up (SU) and 2-2 mark against the spread (ATS). The one constant that remains for bettors is profiting from investments in low-scoring contests as wagering on under the projected total by oddsmak…