First of all I want to thank you for creating this miner, and I know myself how much effort has to be put into software development, so I don't think 2% dev fee is a problem, especially if you get 10 times the sols you got before.

I tested it in a couple of different environments, all windows for the moment, linux will follow, all cards with stock settings:
1050ti => 5.5ksol
980 => 10ksol
290x => 7k
580 => 6.5ksol

tomorrow i should get 2 vega rx 56 will test them too then.

on one win10 pc i have the following:
Platform 0: NVIDIA CUDA, OpenCL 1.2 CUDA 9.1.83
   Device 0: GeForce GTX 980
Platform 1: AMD Accelerated Parallel Processing, OpenCL 2.0 AMD-APP (2442.12)
   Device 0: Hawaii
   Device 1: Intel(R) Core(TM) i7-6700K CPU @ 4.00GHz
Platform 2: Intel(R) OpenCL, OpenCL 2.0
   Device 0: Intel(R) Core(TM) i7-6700K CPU @ 4.00GHz

trying tp run cpu under platform 1 make the miner crash immediately, under platform 2 it works however.