Hi Jack,
The LM5157 is already a very new device. You may consider also the LM5122 as a synchronous converter to reduce the losses in the Diode.
This might be a good starting point: PMP7961 reference design | TI.com
Best regards,
Stefan
The test report PMP7961 shows on page 2 the PCB "PMP7924 RevA which is used for the design of the PMP7961. I did a search on "PMP7924" and I get the documents for PMP7294 which looks nothing like the PCB required for the design PMP7961. I need the gerber…