First, monitors cannot eat something to big, if they can swallow it, its not too big. In fact, they commonly consume prey thats so big, it does not fit. So they digest part, while part is hanging out of their mouth.
Heres the point for this discussion. Larger prey requires better conditions to digest it. Not only better temps(a common cause)But also hydration. Which is also very important. In this case, these two items work hand in hand.
I raise baby monitors(have raised many thousand) with a high of about 110F. I am also the person who "outed" the high temps(135F up). So its not about me not agreeing with high temps.
Now for the punchline. Its basic science. Baby(neonate) montiors, have an extremely high surface to mass ratio. That is, they are lots of surface to allow dehydration, without the stores to allow that(mass) So they dehydrate very quickly. You mentioned an open top cage. Please, that is a death sentence, and sadly, higher temps only make it worse, not better. The more heat, the faster the air moves, the faster the air moves out of the cage, the quicker the monitor dehydrates. Please understand, there is NOTHING to make up for this. You mention half log hides. Those things are stupid, PERIOD. They are of no value and only cause harm.
Heres why, neonate reptiles, in this case montiors, live in burrows(savs) they only use certain burrows, not any burrow. They use holes or make their own, that have the right conditions. That is, they place them where the sun will heat the upper areas and the deeper areas have the cooler temps(base temp) they REQUIRE. They also pick or make burrows that have aprox. 50% humidity. They use more or less as needed, but again, that is a good base. They DO NOT WANT TO BE MOIST OR WET. Double period.
Without question, Savs do not like water, seek water, or want anything to do with water. Water only means flooding and they are about to drown. But, they seek water when dehydrated. That or die.
So when a sav or any non-raparian species seeks water, its out of desperation, extreme need. So, if a Sav poops in the water bowl, or soaks in the water bowl, its normally out of extreme need. Not merely liking something, but they overcome their fear in order not to die.
Yes, sometimes it looks like they like being in water, but so would you if your about to die from dehydration.
The point is, do not let them become dehydrated. Then they will not HAVE to seek the water bowl. By the way, they will seek it when overheated as well. After all, they are not dumb.
So, learn to allow your "rescues" to take care of theirselves. They know how. Learn to provide what they understand how to use.
Reptiles make burrows the exact size they are, there is reason, to not allow air movement(prevent dehydration) They also make burrows to prevent predators from eating them. Half logs do not do either. They are merely a placebo for YOU the keeper, nothing to do with the monitor.
To rescue, means freeing from a tight spot. It does not mean putting in another tight spot. Cheers