Hi Logeshsiva,
I am an R1 rice admit - from India

Let's see if I can help you a bit.
- First of all, great GRE score and great profile overall.
- and yes i do think the yield protection and research heavy background migh - and i am trading this lightly - might be an issue.
- It really does depend on how well you were able to connect your post-MBA goal with your current background.
- Maybe you can take a re-look at your essays and stories and see if the story is coherent (your pre and post MBA) - and if you find it's not, you should definitely write another update stating how the story has been coherent now - what has changed since the waitlist that has made you reaffirm your post-MBA and hence Rice
- hmm best way to signal a school - that they are your top priority - is through continued emails/building connections
- getting a letter of support from current students, showing that you are sincere about climate/sustainability and have done some work (courses, etc) for the same
- continue emailing adcoms - and see if you can secure a 1:1 with them - majority of time it's a no - but you should try regardless.
- I would recommend getting an additional letter of recommendation as well.
- Also, just on a side note - unless you are dead set on going to Rice this year itself - I really do think you should re-review the essays and the goals - your profile is good enough for other schools.
- I really do hope this helps. Best of luck with your journey