Issue Title: Stutter
Description: Stutter in Pitools newer than 144 (= 180, 197, 245)
HMD Model: 5K+
First 3 Numbers Serial: 202
Pitool Version: 245 (also 197, 180)
HMD Firmware: 255
Tracking: 1x Lighthouse v1.0
Windows Version: 10 Pro (1809 build 17763.914)
CPU: Intel i9-9900K (no OC)
RAM: 32GB Corsair Vengeance LPX 3200MHz (no OC)
Motherboard: Gigabyte Z390 AORUS MASTER
GPU Model: Asus RTX 2080Ti Strix (no OC)
GPU Driver: 441.66 WHQL (always used the latest NVIDIA WHQL drivers)
SteamVR Version: not beta (1.9.15)
Oculus Version: none
Did a clean install of Pitool 245 (uninstalled old version, rebooted, deleted Pimax folders under C:\Users\user\AppData\Local, LocalLow, Roaming and C:\ProgramData, and installed new version).
Not using any RGP LED control software. Have tried changing USB ports. Tried changing CPU affinity but this does not help. Not using Smart Smoothing or FFR.
There is visible stutter seen in games, Steam VR test screen, the Pimax home planet scene etc. The stutter is very annoying, distracting. Every pitool after 144 has the stutter.
The stutter is visible in all refresh rate modes eg. 90Hz, 72Hz and 64Hz (currently no 120Hz available for the 5K+ S/N 202* owners ).