Kinda stupid question since I've been away for a while.

Got 2x 290 cards using 390 bios and a 280x mining zcash.

I'm using the latest claymore zec miner for the 290 and getting 365 hashes out of each one.
I'm using the latest optiminer for the 280x(claymore's miner gets only like 80 hashes out of the card for some reason, I think the card idles after a while).
I'm using the 15.12 drivers.


Now I want to ask, is there any room for improvement on the hashrates?The hashrates were fine like a year ago when I used them a lot, but I want to know what hashrates are other people pulling with these cards.
I also saw that AMD released some kind of official mining drivers(i think?) do they have any impact on the hashrate?



Thanks in advance.