AS5 sucks. It's a mediocre paste to start with, and I do not like it on 3000 series Ryzen as they do not respond well to the 'pea blob' way of pasting. The chiplets are too close to sides and corners, the 'spreader' method by credit card or spatula is preferred. Which can put AS5 over the edges if too much is applied, which can be a serious issue. I do like thermal grizzly, but it has had multiple reports of batches scratching the base/IHS due to contaminants or something else, so I'm not that trusting of it. My preference is Noctua NT-H1 (NT-H2 is somewhat thicker and better for gpus), Prolimatech PK3, Gelid Extreme, Phanteks or NZXT stock pastes. CM and Corsair are hit/miss as to which is included with the cooler, some are really decent, some aren't so much.
Not a fan of Aida64. It uses outdated content from 2012 in the linpack it uses, including AVX so can end up with @ 80% to 130% loads in non continuous levels. Kinda sucks to get a stable baseline temp when loads are bouncing all over the place, some peaking well above expected usage. Prime95 small fft with AVX tech disabled is much better for a 100% consistent load equitable to gaming temp outputs. Use of Ryzen Master is also recommended. HWInfo (sensors only) for more in depth monitoring.
3700x is the king of larger cpu power consumption, PPT of 88w, PBO pulling max of 104w ±. Meaning a 240mm (250w) AIO is more than sufficient for decent temps at full boost. The larger 280mm/360mm only recommended for miserable airflow cases, such as the MasterBox 5, or for noise limiting factors from ultra low fan rpm. At low rpm, pull is somewhat more effective than push, so with the AIO's, unless there's a need for rgb fan rings visible, pull is a better option either top or front makes little difference.