Temperatures is HOT topic.
Everything counts, from your case,settings, board,fans and placement, ambient temperature, everything.
I think 360 is well suited for a 7700X, check your BIOS settings or do a CMOS clear if you are unsure.
Use HWiNFO or OCCT to check if its throttling.
The weird part is, a 360 should be more than suffice for a stock 7700X, did you do the install it? Have you using the thermal sticker that comes ore applied on the block? Have you peeled it, some do bring a protective peel. Is it well seated?
I'm saying all this because I have a 240 RoG Ryujin cooling my 7950X just fine, although I'm using it undervolted, I'm allowing it to boost all the way to 5,8ghz just fine under 80C
So it could be a bad seating or bad AIO. Check if the tubing coming out of CPU is hot and if the pump is making noise.
Whats the Idle temps?
Good luck
The Englishman