I apologize if this has been asked before (probably has).  On dual mining Claymore software like ETH/SIA (for example), if one of my miners has 6 cards, with 2 dual mining and 4 single mining, how will I be charged? Will I be charged 2% on all six?  Or will I be charged 2% on two and 1% on four?  Thanks for your reply and patience with any redundant questions.

I have several rx480s using Boysie's ROMs, getting 30 MH/s on ETH, using Claymore ETH/DCR 7.4.  I installed Claymore 7.0 for ZEC, getting roughly 160 H/s on the same rx480s.  I decide to switch back to ETH, but now I only get 15 MH/s.  Yes, a 50% drop!  If I install the stock ellesmere ROM, I get 24 Mh/s, and can boost that to 27 Mh/s with tweaks as usual.  However, it seems the ZEC Claymore application 'BREAKS' the hashrate of the Claymore ETH application, if using a modified ROM.  More importantly, this is permanent.  Well, semi-permanent.  I found if I COMPLETELY REINSTALL my OS and switch video cards between workers - essentially completely start from scratch, I can get them back to 30 MH/s.  However, if I run Claymore 7.0 on ZEC just ONCE, they drop back down to 50%.  Anyone have any idea what is getting switched?  I thought it might be registry settings, so I restored the registry.  No good.  The only thing I can find that fixes it is a complete reinstall of the OS, in addition to erasing motherboard BIOS.