AIDA64 results are quite decent, they will show the averages pretty accurately, what is happening is that you're pairing a low end cpu with a very high end memory (4000mhz) and you will indeed find excellent results, the problem with dual channel memory is that you are on the limit of what is achievable with dual channel.
You will see very often 100GBPS + results with Quad Channel 3400+ Memory. So don't compare yourself against "Stock quad memory".
You're comparing extreme OC Dual Channel vs "Regular" Quad.
But your results are pretty good and I didn't know it was possible to OC the memory on the 9400F
I've been using exclusively X79, X99 and X299 for far too long so I was unaware of that.