Reaction Viscosity Reducers

I'm NOT a chemist, but from my 2 semesters of organic chemistry, here's my take on this...

I don't think with the given information that anyone (even the super-chemists out there) is going to be able to give you an answer. Organic reactions while categorized have different means, methods, and intermediaries to a desired product. You're looking for another inert solvent, but without knowing what you don't want it to react with. See the dilemma?

While I applaud your desire to improve, you're going to need to describe your inputs (exactly), the process (exactly), and the desired products (exactly) in order for that chemist out there (definitely NOT me) to give you an answer.

Best of luck!

What sort of scale are you doing this on and what temperature is the reaction. I take it the "product" is not soluble in the TCB? This is important in trying to identify viable alternatives.

Since you allow it to sit for a while to achieve separation, could you employ a centrifuge to speed up the settling? Gravity is a cheap commodity and a centrifuge is a "gravity accelerator". Your centrifuge would need a channel for the solvent to be removed, and a way to peel out the settled polyamide.