IS YOUR INDUCTOR CURRENT smooth?
Have a look at the voltage across the sense resistance...is it a regular triangle wave?
If not then maybe you have instability.
Sometimes, surface mount inductors cam make noise esp if the inductor current is not smooth.....also maybe the 1khz pwm may be making the inductor coils vibrate and make noise...maybe you need to go thru hole inductor to solve it....ceramic caps can also make noise, but my money os on the inductor....desolder it and solder in twisted pair wire to its pade, and solder a inductor to the end of this twisted pair and see if you still get the noise.
Maybe it is your layout though...maybe you have routed the noisy switching node over the controller...? maybe you need to correct this, or increase the fet series gate resistance to delay the drain voltage transition.
also GI, ADJ TADJ and REF pins....are you sure they shouldn't have a decoupling capacitor connected to them? to ground.
My money is on the layout, or the inductor