Every strain is different, but if you put a sample in a thin film (<1/16") and start raising the oven temperature without vacuum, until it fully melts, that is the temperature that the surface tension is low enough for bubbles to readily escape, and which you can most rapidly purge the solvent with minimal decarboxylation and loss of monoterpenes. Start vacuuming at that point if your goal is shatter.
Start lower if your goal is a wax, and pump longer.
Since the material ostensibly started out as a carboxylic acid shatter, it should remain that way unless your process changes it to something else.
It also doesn't take copious experience to reliably produce shatter, but it helps if you have a good process, and equipment to support it.
I just helped install and instill life into a Pharmgold Mk IVC, as well as train the excited new owners to run it. After two runs using low grade electric trim to clean the pipes, which we discarded, we made a practice run using prime material, and elected to turn it into cotton candy before removing it from the Mk IVC for subsequent processing.
It came out of the collection tank a pale yellow solidified foam, and a bubble is about the thinnest film you can draw a resin into for purging purposes, so we chilled it further in a freezer for about 30 min and used a spatula to turn it into a fine dry powder, which we sprinkled on parchment and were able to easily meet residual solvent standards after only 4 hours, leaving the extremely aromatic end product in pull and snap consistency, with THC in the high 80%. A surprise couch locker on anecdotal testing, due to extremely high mycene.
Based on those results, we tweaked the process by freezing the column overnight and dropping the inject temperature of the n-Butane to around -20C, using liquid N2 as coolant through the Mk IVC's counter flow injection heat exchanger.
Since it was for a cup competition, I simply watched and offered encouragement and council, while the new owners strutted their stuff with their newest equipment and training, using material from their own gardens and curing process.
That further lowered the plant wax pickup, which reduced concentrate cloudiness, making it even purdier, while leaving it highly aromatic and tasty, as well as in pull and snap consistency. I returned home before seeing the lab results, but I predict an increase in targeted elements, given that we've further decreased the amount of plant waxes extracted.