I also paid Branko to assist with my bios as I was targeting higher XMR speeds. Definitely worth the ETH if plug-n-play bios are not working for you, and you are having trouble pinning down timings with these picky hynix cards. Branko was friendly and helpful, and I never felt that he was going to run away with my eth, or that he was impatient or tired of working with me.
Just be aware that variations in cards can affect results. One of my sapphire 560 4g OCs bumped up nicely to 440 from 320h/s with his timings, while the other identical card was resistant to anything but very loose timings at a high clock rate, and still couldn't get past 400.
It seems that the OC cards from various manufacturers that are using overclocked hynix memory can be tough to tweak and vary from card to card.