Heisenberg strenuously
avoided making assumptions about the underlying nature of matter. He made a point of restricting himself to what the observations or interactions showed, not what might or might not go on in between*. He developed a form of mathematics (later called matrix mechanics) to describe that. What is
observed is that QM entities manifest themselves in interactions at specific locations, e.g. the dot in on specific spot on a detector screen. That's what we mean when speak of them as showing particle behaviour.
You are forgetting the other side of the Uncertainty Principle. Position and momentum are "conjugate variables", so if the position is precisely defined the momentum is indeterminate, and vice versa: the more the one is tied down the more the other is uncertain.The momentum is, as I have explained, associated with the wavelength of the QM entity. So you don't know the frequency of the wave either.
The Uncertainty Principle takes no position on one being more "real" than the other.
The Uncertainty Principle also applies to other pairs of conjugate variables, most notably time and energy. For example, if the lifetime of an atomic excited state is short, i.e. its existence is not much extended in time, its energy is ill-defined, whereas a long-lived state will have a well-defined energy. We observe this in what is called the "uncertainty broadening" of spectral lines. As the pressure of a gas rises the frequency of interatomic collisions goes up. These collisions will deactivate excited states of the atom prematurely, shortening their lifetime. So their energy becomes less well defined, leading to a borader range of absorption or emissions frequencies in the spectral lines we observe. (There is another broadening effect of gas pressure, due to distortion of the potential experienced by the excited electron due to the approach of a neighbour, so both effects in practice contribute to line broadening.)
Notice how in each case the theory is supported by
observation of nature. This is what distinguishes actual science from the made-up stuff a crank pulls out of his arse.
* There is an excellent book on this, by Carlo Rovelli the theoretical physicist, called "Helgoland". It is named after the island to which Heisenberg retreated in order to have the peace and quiet to develop his theory of QM. Heisenberg modelled his approach on Einstein, by throwing out all previous preconceptions about physics and just looking at the observations and what they implied mathematically. That's why he needed to get away from it all to think it through.