It might be easier to open your existing USB bar and swap out the resistors for weaker ones. The brightness issue won't be fixed solely by adding more LEDs if the resistors in the new bar are still too enthusiastic for USB power.
OS: Windows 10 64 bit Professional
CPU: AMD Ryzen 5900X
RAM: 16GB
GPU: Radeon Vega 56
CPU: AMD Ryzen 5900X
RAM: 16GB
GPU: Radeon Vega 56
