@Gertjan
I from time to time, also love to game, and there, buffbloat fixing is important, congrats to you, to have fiber connection!! Me only on cable internet 1000 MBit (LOL, Vodafone promise is a lie, only keeps that speed in deep night, as cable internet is a shared connection, in evenings, often bad bufferbloat values and speeds below 1000 MBit) and my uplload as always in Germany, is sadly asynchron, limited to only 50 MBit upload sadly. But its all OK, I as a private person/user, can live with that. Enjoy your Fiber connection!! Hope one day, we will also be able to benefit Fiber Quality connections. SQM is just, fantastic on OpenWRT, best for fixing bufferbloat with SQM and piece_of_cake setup.
I do my Bufferbloat testing here -> https://speed.cloudflare.com/
Shows detailed info on nearly all parameters