Both 8-pin and 4-pin power cables are required for the Ryzen 7 9800X.
Both 8-pin and 4-pin power cables are required for the Ryzen 7 9800X.
About 99% of the time chips don’t require dual 8-pins, except for the motherboard which adds extra features.
Without understanding the exact meaning of "pushes down," it's difficult to assess. In person, you should be able to tell if something is harming anything.
Running both 8 pins just provides theoretically smoother power delivery. If you were into LN2 cooling, I'd say use both, but outside that you're fine with just one. Even a single 4pin would likely be enough As for the pressure on the cable, that's kind of a "if it works, don't worry" situation. It's just power and through chonky pins at that. All it really needs is contact somewhere along the pin.
It's not a 12VHPWR connector, which means you should be okay as long as it's fully seated and you're not applying any force.