Thank you for your question. I look forward to working with you to provide you the information you are seeking.
Yes, you are allowed to sue pro se in Indiana. The courts and legal system in Indiana is very home grown in the smaller or more rural areas, which is likely why you could not find any attorney willing to take the case and you would have to have gone outside of the area to one of the major cities to get an attorney to take the case.
You are going to have to prove knowledge of the seller or agent of the defect and an intentional failure to disclose, which I am sure you have seen in the Indiana case law and why you say it serves the seller more than the buyer.
However, to your question of can you go pro se, you absolutely can do so.
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