Noise problem with buck/boost switching regulator
I think you'll have problems with your layout. C3/C4 MUST be closer to pin 1 (EDIT this should read pins8/9 not pin1). When I say closer I mean living on it! Ditto C7 - it needs to be camped right on pin 7. Now I've never used this part but this is standard procedure for this type of device.

Think about the current pulses flowing from pin 7 to C7 and the length of track between it and the IC - probably 20nH of track.

The ground return of C7 - where is it going? It's going right back to the wrong ground pin (signal ground). C7's ground should be as short as possible to pins 5 and 13 as possible without breaking trespass laws. And this should be your star-point for keying off signal ground. Signal ground should then go to your feedback components and not pass any load or C7 current at all.

I would decline testing this PCB if it was handed to me. Sorry for being abrupt but these are golden rules on switching circuits: -