I'm almost 100% sure this is fixed with GCN 2 and higher cards. I have not seen this with Claymore miner on my AMD rigs, they're still mining at pretty much exactly what they were when they first came out. If you're getting subpar hashrate either your memory speed is lower, you have bad type of memory, or you haven't tweaked your latency properly. Hawaii is GCN 3, Polaris is GCN 4.
If it isn't fixed, do you have a source besides 'you can see it with claymore now' which isn't observable?
you are either lazy or stupid. This is the biggest news in mining and discussed and admitted everywhere. Just use --benchmark option in claymore and you'll see that polaris cards are loosing 0.1-0.2 mhs from each new DAG. This started 2 epochs ego.