HP Envy 16 broken using Thunderbolt charging

[LC104]

I have an HP Envy 16 with 12th gen Intel core I7 CPU and when using it with my HP G2 docking station, or any other dock I have that provides power over USB-C, that laptop always throttles down to 400 MHz (actually 399 Mhz per the Throttlestop tool) and becomes utterly useless. It literally takes a minute just to click on a window and refresh the screen. So I must always keep the 150W default AC power plugged into this.

If I plug my work laptop, an Elitebook 840 into this docking station, it runs fine, it charges fine. If I plug my Macbook into this docking station, again everything runs fine - all the accessories light up and the charging works too. It's just this HP Envy that doesn't seem to work. 

What I don't understand is that if this Envy laptop is a power hungry machine, why can't it just slow down when the charge input is a lower wattage? - who set this thing up to throttle and CRAWL when it receives lower power (or is this just a bad CPU/motherboard?). When I unplug the dock and run just on battery power, the laptop speeds up, so why is it just slowing down with a low wattage input? 

Note the exact same problem occurs if I take the laptop without the dock, and plug in a 65W power supply. The HP Envy CRAWLS at 400 Mhz, while the HP Elitebook works like a champ - what gives with HP Envy PCs? I thought this high end CPU with 32GB and dedicated graphics card would be a rocking machine and it's been a dog. As an owner of many HP products, this is really disappointing. Can someone confirm that my laptop is a lemon or if ALL of the HP Envy (with I7-12700H CPUs) have this terrible behavior. 

Thank you!