Blades designed for a smooth finish are often too thin.
Try Bosch 144D's which are really thick blades, and go slowly rather than forcing the saw. In this way you can still get a fairly good finish as the blade runs against the same edge a number of times.
I've only ever used cheap and cheeful jigsaws myself, and the biggest mistake I've found is to try and push the saw too hard through the work given the relatively low power of the motor.
Unlike the expensive jobs you see featured in Youtube videos zipping through 28cm worktops, as if they were butter.
In the past the Bosch website had comparative tables for all their blades with the blade thickness/set/kerf - which is how I selected the 144D's, in addition to the usual length and TPI. But the site now appears to be dumbed down or maybe it was only ever on the German site.