I believe thre is a different between enhancement abradants and reinforcement abradants.
Grade "A" equipment reinforcement abradants (the best you can get on IM besides deluxe) only preserve your rings 80% of the time. You can still lose them 20% of the time. the deluxe reinforcement abradants are the only ones guaranteed to be 100% preserve on fail.
Not sure you can use enhancement abradants in the same place as reinforcement abradants. If you can, it would make the Grade "A" equipment reinforcement abradants costing the same pretty pointless.