The idea of pushing one's SUDS level up to get "faster" results is unlikely to work and is as simplistic as taking expecting to get better faster if one doubles the dosage of a medicine
No, that's not how it works.
I'm not advocating for it, by the way. I'm speaking from a combination of experience, and research. I'm also happy to be proven wrong. But PE works through repetition, and there needs to be stress present in order for the repetition to create de-stress. You can't expose yourself to something that is not a stressor, simply put. There's nothing to expose. And there's not so much a zone called 'too much stress', as there is a point at which you cannot hold together and tolerate it.
So, when you double the dose of a medicine, you can reach anything from non-eventful to toxic levels. But when you increase pressure on exposure work, the threshold is simply, can you tolerate the pressure. A crude analogy would be more like, eating a bowl of crickets if you've never had crickets before. Doing it very minutely and very slowly, it will likely stay moderately unpleasant start to finish. Try and just shove the whole bowlful down your throat, well, if you can - great. But if you vomit it all up again, it didn't work. Purposefully chewing through them while maintaining your presence of mind is the way to go. If you can do that five at a time, it'll go quicker than 2 at a time.
So long as you, the individual, are capable of remaining present and tolerating the stress - you can push yourself has hard as you'd like. And, in my own experience, it does progress more quickly. Sometimes, faster is better - if you have a limited amount of time to cut the intensity of the problem in half, say. Sometimes, you need to be functional in other ways that would encourage you to not be so immersive.
The re-traumatization notion then follows; if the actual pressure of the exposure is too intense, causing you to lose your grounding, you potentially create a new layer of trauma right on top of the original one. Experientially, it can lead a person to want to just stop and never open the pandora's box again. I'm sure many people here can speak to having pushed too hard, too fast into doing trauma work. But it is going to be unpleasant and stressful at the outset; that's the very nature of it, and it's why it's crude and other methods were developed to try and circumnavigate the scale of the upset that occurs.
This is borne out by our current understanding of the underlying neurochemical processes.
I think you are talking about habituation, not exposure. But I'd love some recommended reading that backs this up, if not. It has been awhile, for me.