Animated short in a theatre - critique and other issues

I would have posted this in more technical section, because I’m making this first post for advice on cloth simulation, but I also want critique as I finish this, so here goes.I’m currently creating a rough animatic for a short scene in a theater.

Summed up simply, the curtains open to reveal a glowing red box, which then gets assassinated with paintballs.

I have rough versions of most of the set assets, including cloth sims, fluid sims and explode modified versions of the box ready to incorporate.

But here’s my first problem. To save on render times, at least for the animatic, I’ve set no collisions for the cloth. Rendered on it’s own, from the original Curtain.blend asset file, the curtains open well for a rough version:

(using an armature that shrinks towards the left) but no matter how many times I “Alt+A” to preview, and let blender calculate, the motion of the cloth in the full scene, where it does play correctly, as soon as I render from this cached data, the cloth flies off in random directions - up, down, left off screen. It’s never predictable where:

Any ideas why and how to fix it?

I wont blab on too much longer, but any other crit on this early stage of production is appreciated.

I eventually plan to add lots of detail to the set, making it feel less like a cardboard cutout, and populate the chairs - probably with items of stationary in fancy hats (pens, pencils, staplers etc) making lots of ridiculous noises (ooh’s and ahhs with screams of terror at the assassination) but am leaving that for now to save on test render time.

Thanks for your time and goodnight.

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