If we accept that the big picture of the Principal Force is correct, or at least interesting on an astronomical and larger-than-atomic scale, what about the tiny stuff?
The unification of Quantum Physics (QP) and classical physics has long been sought after as the holy grail of physics. A new theory of "gravity" needs to fit all branches of physics to be really interesting.
The Principal Force theory states that anything on a large scale (super-atomic / larger than Quantum Particles) is actually linked directly to the QP through the concept of Principal Force waves working on and to some extent controlling the QP. In fact, the Principal Force does not work on anything other than the Quantum Particles (i.e. waves or their "sub-stuff") themselves. The Principal Force is not only the weak QP gravity force, it also adds the properties to QP that holds the sub-atomic nucleuses together and control their state through related effects.
After all, any atom is built by Quantum Particles and molecules are built by atoms. What other "stuf"? would "gravity" (which is the Principal Force) actually link to and create a push/pull on than atoms and/or their sub-particles? Would Gravity be able to selectively affect only a certain size of molecules? The obvious answer is that gravity does not exist as explained, while Principal Force waves affect QP.
Principal Force waves are in fact the effect observed as "gravity" as explained, and it most certainly does affect (sub-)atomic and Quantum Particles. This happens in the same general way Principal Forces push galaxies apart and leave a galaxy to be held together by the same forces, but the small-scale QP physics complexity may be far greater to understand.
Principal Forces are able to exert its forces onto atoms or sub-atomic particles. But, at this level it's no longer obvious if the Principal Force effects themselves start playing around with the mechanics of the atoms and quantum particles or ?stuff? at an even smaller level.
Regardless, quantum physics may as a result be understood in the context of Principal Force waves and be
combined/modelled with the same using the same physics or a linked/similar approach (i.e., PF in the light of QP). This would be the holy grail in physics, that change the big picture of physics, leading to a unified understanding of physics.
The Principal Force theory does not suggest (as far as known) that
the current observations and most of the modelling and mathematics within quantum physics are wrong or needs to be discarded. The theory does however add a lower level of cause and initiator of effect.
Principal Forces pushes/keeps all "stuff" like quarks, protons, electrons, neutrons, molecules and so on together
on a smaller level and this goes up to the largest scale, while also Principal Forces ensure that any level of "stuff" do not collapse into nothing as it provides a push in
all directions. The levels (quantum vs atom vs molecules vs solids/gases vs
etc.) are maintained by a balance provided by the relationship between the waves/radiation
density each interaction allow for, based on interaction density and distance.
Properties of the PF dictates that it will only interact at the certain level.
If inbound Principal Forces are strong on a very small level ( (sub-)atomic) the atoms may collapse or deform
fully or partially. This may also be the case for quantum particles if they are
built from another even smaller level of PR interactions/systems. This
behaviour is what happens in black holes and in collapsing stars where
molecules and atoms (and quantum particles?) break down.
In short: Quantum physics may "simply" be the detailing of how Principal Force waves create a very small-scale buquet/bouquet of spin, level jumps, observable "energy", duality, magnetism, forces and so on. As Principal Force waves is the fabric of stuff according to the theory, also any measurement becomes at least uncertain, if not impossible. As Principal Force would not support the interpretation of quantum physics having "isolated" quantum particles/entities, quantum entanglement would certainly be viable.