Well i wouldnt say they go thru the same dehydration that nuggets go thru.. but i will say that the moisture that is caught between the heads is the most important moisture to rid yourself of.
Now the essential oils ie terpenes and terpenoids you speak of. are definitly able to evaporate .. as you can smell them in the air in both the grow room their grew in as well as the room your drying your hash. However with that said.. there is no way to maintain those volatile oils from evaporating during the drying process.
Now if youve pressed your hash with any amount of moisture in it.. its going to be very very difficult to remove it all. The fridge is not going to let you properly cure your hash either. It will remove some moisture from the hash each time.. but the amount of times you would need to put it in to actualy rid yourself of all of it..
it would be much easier to powderize your bubble and allow it the proper surface area and dessicant( cardboard works great) to remove the excess moisture and leave you with a nice smoking final product.
Feel free to come into Chat sometime and ask live questions as well..
hope this helps
Peace
Bubble man