akasa cooler is probably the worst performer among other after market CPU HSF solution, so you can replace akasa stock fan with noctua fan, if you're reusing that cooler on 8600K (probably you had non K CPU) then I bet 8600K won't perform to its best.
AFAIK, intel marketed 95W TDP for 8600K, that 95 watt is on what state? single core base clock or boost clock? many online reviewers benchmarking 8600K would draw above 120 watt and on OC tops to 180 watt, so if akasa max TDP ability is at 95 watt then ......