No, your BAP is working. Again, the fuel pressure is controlled by the relief valve in the pump assembly. The BAP controls fuel FLOW. The additional flow supplied by the BAP prevents the PRESSURE from falling below 58 psi ( ALTHOUGH YOU CAN SEE A SLIGHT PSI DROP AT THE RAIL AT WOT). The BAP pressure switch activates the BAP only when the engine is in boost.
We have no record of an actual BAP failure in the last 6 years. MILLIONS OF MILES, NO FAILURES. It is used on all KB kits. The concept is now also used by our competition on their kits. It is very reliable. And the BAP on a Dodge will support up to 775RWHP. That's 400HP over stock.
We have our own Dual Pump System designed but +775RWHP applications are rare so the sales picture isn't all that attractive. Also, multiple pump systems are VERY expensive, they heat the fuel, require re-tuning, rewiring and re-plumbing to a return style system. The only application we recommend dual pumps for is the +775RWHP. As the old saying goes "If it ain't broke, don't fix it."