I’m not sure what you’re end product is, but if it has liquid terps in it. You can not purge like that. You’ll just be boiling terps out.
If it’s shatter the post processing is different for sure. All this depends on the consistency of the product.
Thick like shatter, lots and lots of vacuum.
Thin and watery low vac.
To each their own
If your adding terps in, why do it under vacuum at all? Heat it and stir it. Voila
Honestly I didn’t know I could use less vacuum and achieve a complete purge. That’s was one my concerns when buying this diaphragm pump, because it’s limited to -29hg, I was unsure if it was enough vacuum to fully purge the etho
I decarb under vacuum because; until recently I didn’t have a hot plate stirrer, was told ovens are inconsistent and not ideal, and I read decarbing under vacuum helps reduce oxidation and help preserve some of the color, which it seems to be working. I don’t have a pressure vessel to decarb in so I achieve a similar principle of removing oxygen to retaining color at the cost of terps.
I only reintroduce terps when mixing the oil before filling carts. I heat and stir, just bought a homogenizer
I didn’t think losing terps was a big deal for carts considering most are made with distillate. I did turn a bunch of crumble/sugar pho and turn it into nice hard shatter before decarbing it, I guess it’s because i boiled off the majority off the terps.
I also thought terps boil off based on temperature not pressure? I use to never exceed 160’f until I started decarbing in the chamber
Vacuum reduces the boiling point of everything in the vacuum.
If we’re talking about the terpenes that come from the garbage material that disty is generally made from then yes you’re right, we don’t care at all about saving those terps 
If you’re making bho and like the natural terpenes from your product you should try to save the terps.
If you’re happy with what you’re producing then don’t let me steer you in another direction.
Appreciate the info, I’ll try it low and slow next time and see how I like it. I’m just paranoid about residue solvents
Solvents we use have very low boiling points at atmosphere. Bringing under vac makes it even easier to pull it out.
What are your extraction parameters?
Are you jarring it? Or going straight to the vac chamber?
I’ve been buying oil from a friend. I then winterize, purge, decarb and introduce hemp terps. I used canna terps last time, but I have about 30ml of hemp terps left to use.
I’ve debated dissolving some etho to see if I can get it to crystallize. I would love to make my own terp sauce, but I haven’t figured it out yet. I know I could redissolve in butane, but I don’t have a vessel for that
You also need to flip your Slab to adequately degas.
May also wanna check out some tips and tricks Tricks of the trade