LM5041 converter has some instability/audible noise issues

Hello, This is my first post.  I have just finished a converter design using the LM5041A.  My circuitry is similar to the one in the application note 1299, a current fed full bridge synchronous converter.  Despite efficiency measurements in the 91-95%  area, there are audible squeals from the converter at some combinations of input voltage & output current - I am still looking for the cause. On closer examination of the application note and data sheet there appears to be an anomaly, the data sheet says  "An internal MOSFET discharges the external CS pin for an additional 50ns at the beginning of each cycle to reduce the leading edge spike that occurs when the buck stage MOSFET is turned on. What puzzles me is that in the high side drive signal from the lm5041 there is a 750R/100p delay + the propagation delay of the lm5101 + turn on delay of the mosfet - it would appear that the buck FET only begins to turn on well outside the internal 50ns blanking time on the current ramp sense pin ?  To avoid disastrous shoot through current issues sufficient delay must be added in the FET drives yet for the upper FET this also subtracts from the intended internal blanking time ?  Is it feasible to create an external CS ramp clamp that clamps the CS signal for 50nano-seconds after the buck FET is actually driven ( using a simple differentiator timing circuit driving a small mosfet clamp ?  Any help would sure be appreciated.  My attempts to stop the audible squeals have included playing with the values around the CS pin, CS transformer, and the isolated output voltage control which is fed back to the comp pin with an optocoupler froven by a TLV431.