We have designed a board with a TPS43060 to convert 24VDC in to 50VDC @6A out. The part was unstable until we increased the gate resistors above 82 ohms. The FETS are both TI CSD19503KCS types that have a gate charge (Qg) of about 24nC at Vgs=8volts. Why would the stability depend on the gate resistors?