The 55C bed is an odd choice: normally, 60C is what people use for PLA. This suggests they either blend it for adhesion or their matting agents actually _lower_ its Tg. Their own numbers don't seem to bear this out, although they only give HDTs, not Tgs: https://wiki.qidi3d.com/en/Memo/Filament-Guide
That PA is _ludicrously_ high for a voluflow cap of 20. Assuming typical 0.4mm nozzle numbers (0.4mm EW, 0.2mm layer height), that's a speed cap of 250. But it gets better!