What do you ask when you are tired of hearing 'interesting'?

I am not convinced "I think I am presenting the idea too early and they are being nice" is the constraint yet. The people who saw it may have been the wrong room.

What was the first sign you trusted in "I leave without a story I can build from"?

I would stay with "My calls end with encouragement" for the week already named. A quieter result is still a result.

I have been adjacent to this. The sentence I would not skip is "My calls end with encouragement". Finding who it is for mattered more than adding another feature.

I end with 'what did you do instead this month?' If the answer is nothing, the problem is not a buyer yet. That question offended my ego and saved a quarter.

Ask them to walk through the last time the problem happened, before you mention what you are building. Interesting is what people say when you have already shown the slides.