For the record, I've been running stable at 300M chip frequency and 71.5gh/s average for the past 4 hours. All chip temps are the same as they were at the 282M setting. In any case, I've moved back to 282M until I can confirm many batch 1 and 2 units have and can be running at that rate safely for long periods of time.
Perhaps you should disclose if you have received a defective control unit
https://bitcointalk.org/index.php?topic=140539.msg2325811#msg2325811that overheats and if you fixed it to prevent this from happening?
If you sell it, do you give guaranty? Can the buyer get support (replacement parts) from Avalon?