14060 kHz / 32 sounded good.
So does 7030 / 16.
How about 7040 / 16 then?! It gives 440 kHz, that is even closer to the I.F. of 455 kHz.
I should add this feature to my xtalfind.pl utility.
I also tried out the receiver and with my finger as antenna a DRM transmission was clearly audible on 9.8 MHz band. So I'll proceed with this IF downconverter project.