Same here epic failure  for r9 280 Dual-x  (compute errors, 0 h/s, red everywhere, no need to ask drivers, oc, compute, lock memory pages all ok! i have a Vega 56 rig too doing better but still 100w more for V8 than V7 and 100h/s less...
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i dont want to be disrespectful with your awesome work and support (really) but:

As you ask on your 1.7.0 release post: NO! WE DONT WANT USELESS EXTRA TUNING GADGETS to mine 10h/s more but screwing up 50% of our gpu's and all pasts benchmarks.

I mean of course if it's usefull, like very usefull i'm ok but:
i MINE : CryptoNight ,CryptoNightAlloy, CryptoNightArto, CryptoNightB2N, CryptoNightFast   ,CryptoNightHaven ,CryptoNightHeavy   ,CryptoNightItalo , CryptoNightLiteV7, CryptoNightSaber, CryptoNightStelliteV4,   CryptoNightV7, CryptoNightV8 with a profitability switcher that i coded
if i need to bench (x8)²x508x48 possible settings/cards/algo on every release i'll rather to stop using a tool that will makes me spend more time to bench and set up than to mine ...

SO PLEASE YOUR PROGRAM IS GREAT!= new goodies or i dont know how do you call this (fragments, bralock, aes) and all these ****** settings which makes me pull my hairs off for 1 week to earn what: 10h/s or 0========E X I T !