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I need a fresh approach for my extruder clacking. (V-Core 3.0 400 with Duet Board)

I have a v-core 3.0 400mm with a Duet 3D Board, a Rapido UHF in HF mode (with a NozzleX) and severe issues with extruder clacking. For a while, the extruder clacking was only with Silk PLA which appears to not like Retraction very much (my working theory is that it's widening during the retraction phase, causing a Hotend Clog). However, today I tried to print standard eSun Pla+ after some time (which never made any issues) and I started having extruderclacking there as well... What is interesting is, that the clacking only happens after some time into the print, which may suggest Heatcreep but I don't know why this would get progressively worse and I'm also running the hotend fan at 100%. I also just dismantled the fan and looked at the cooling shroud for dust but it's still very clean.

I seriously need a new pair of eyes to help me get a new perspective here.