The Sun also wobbles because of the planets. Primordial black holes are (depending on theory of creation and path in later life) smaller than stellar black holes, maybe far smaller, in the order of lunar mass or even particle magnitude mass. So the wobble from a PBH will be overshadowed by that of Jupiter and the other planets. The sun doing a wobble of more than 30AU (what you would expect for a 1 solar mass PBH somewhere past neptune) with respect to the galaxy would have been detected ages ago, even the parallax measurements of yore are precise enough for that. From that fact, the magnitude of disturbance in other planets' and TNOs' orbits and the absence of gravitational lensing observations, our PBH should be in the order of planetary masses.