I too had experienced various bugs and difficulties when I installed my Pimax 4K , and installing ver. 3 of Piplay made the ghosting reasonably unacceptable.
I think improving Piplay and software side should be top priority secondly only to finishing the 8K design and optimization since Piplay still has various bugs and compatibility problems with Steam VR and other software.
@xunshu - I seriously Hope Pimax is really planning to invest more in the software side and Piplay to support the 5K/8K in the best way when it will come out.
Having a top notch, feature rich software and drivers is just equally important to make a winning product, otherwise it could potentially mean the ruin of any hardware, even it is the best available.