Flex Plate Bolts...

Round off the head of one bolt......one bolt! And now you have an issue with them? Come on! You know how many people use ARP fasteners (studs, nuts, bolts, washers etc) in general and the only way they get messed up is from the installer using a junky tool and/or improper use of the tool. Skip the grade 8 thick headed bolts . Buy the correct bolts for that torque converter.
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The heads are thin for a reason. Use a quality wrench, not cocked or otherwise on the bolt head. That’s the only reason there was an issue in the first place with your head bolt. User and/or tool issue. Like I’ve said, we’ve all been there. To deny is just being in denial!:eek: