Nope. You can test them. Procedure posted a dozen times around here.
If you removed enough water, they get hot when you add more.
Maybe start here: Molecular sieve beads
Machine trim? Or machine trimmed bud?
Potency test on input?
You freeze it first?
Sure you’re not coating your trichomes in ice?
How high are you? (Altitude). 28” isn’t deep vac unless you’re a ways above sea level.