Hello everyone.
I was suffering with TN spikes since day one. I have an Acer Predator Helios 300, with 32GB RAM, RTX 3070. Using FSR Frame Gen (RTX 3000's series doesn't support DLSS Frame Gen), it was unplayable. Without FSR Frame Gen, I was able to play with low quality, DLSS, 1080p, 80FPS, not suffering with TN spikes so often.
After the last update (Season 3), I'm not suffering with TN spikes at all. Now I can play at high quality, DLSS, 1080p, 120FPS with FSR Frame Gen without any TN spikes. It rarely happens when I respawn and when it happens, it rapidly stabilizes.
So, I think they changed something on the net code and the problem is solved now (at least, for me).