For fiji at the moment yes, can confirm that is hat problems with lolMiner. I will try to fix it in 0.4.

I user Optiminer, when I increase intensity, GPU use more RAM and speed is up. -> For stock core and reduce core volt get speed 13.2k

In lolminer -> stock core and reduce core volt get speed 12.4k and OC 12.8k
**R9 nano --set-work-batch 7 is the best speed for more or HIGH speed is drop

Hope this information will  improve speed up more than Optiminer