More of a bump because I'm no expert.

Wouldn't a Hoka Tracer or Hupana be the obvious choice? Anything is going to be firmer than the Bondi (not a criticism I really like Hoka) and another Hoka shoe will have a similar drop. Maybe something with RMAT instead of EVA. No idea what your priorities are for a treadmill shoe. I'd guess ventilation? Not sure about durability? Outside Hoka - Asics 33 range and Brooks Pure range should have a similar drop. But, as I say, more of a bump than good advice.

Thanks Oddslug! I guess to be more specific, the Bondi on the treadmill is unstable enough to the point where I can feel it in my knee. Between the shoe and the deck, too much cushion and not enough stability. I have used for the treadmill the NB 1080 and they were ok. For the treadmill my preference is a soft ride with Enough cushion to be comfortable but not loosing stability because they are so soft when coupled with the deck. I do put a power step arch support in all my shoes. Just seems to work for me. I took a long break From running and a few years ago started back with the Bondi so I’m out out of the loop on what’s out there. Been using the treadmill more for recovery/easy runs here and there.

Try the Mach 2. I use them on the treadmill all the time and they're pretty responsive and not at all squishy. I'm a size 10 normally but went to 9.5 as the toe box is pretty roomy and my foot was all over the place in the size 10 especially when wet.

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What's your CdA?

I’m using an old pair of Clifton 2’s on the treadmill. Love them.