Forgive me for being ignorant, I’m trying to read through this whole thread. But isn’t it more important what sort of investment material the casting company uses / burnout method? So that would highlight their ability.
For example, we (we’re not casters, we’re a dental lab - we found out that the visijet green was extremely volatile during burn out and would periodically bubble so violently that our investment would create microcracks which resulted in fins etc etc.
Swapping to a more durable investment helped with the fins but then the viscosity of the material made it difficult to inject our lithium disilicate glass (which has about the same viscosity as a Non-precious to semi-precious alloy).
We ultimately found out that if you thinly coat the surface in shoe polish, it somehow lowers the temp and creates a less volatile event during burnout.
Pending proper sprue locations etc etc.
The alternative of course is to just simply SLM the alloy you want - but i don’t think they’ve figured out the appropriate acid bath to get the surface finished as nicely.