I personally have found that dewaxing usually helps with slab stability.
Be it in-line or second solvent (aka winterization).
More importantly, it reduces the amount of non-target molecules (fats & waxes) your users are huffing, and hence reduces impairment in lung function.
If the object of the game is to make translucent, pale amber glass, you need to extract cold, and winterize. you’ll loose terps. but that is deliberate. you’ll gain stability.
if material has specific terpenes, or just high terpenes in general, it may not harden up till you cold boil some of them off.
IMO the real object of the game is to hit an acceptable solvent level while retaining a faithful representation of the terpene profile from the flower. Terpenes are solvents, and different terpenes are going to effect the viscosity of your oleoresin to a greater or lesser extent.
You can force a live resin to form shatter, but you’ve almost certainly wrecked an excellent extract to achieve that if you do.