We have what you describe in the form of a 2 or 3 page attachment at the end of each briefing pack and it's almost universally ignored because it's nothing short of ********.
I have flown to the same two destinations now for the last 15 flights. If we had loaded plog fuel on each occasion, we would be arriving in each case with 200-300Kg less than minimum diversion fuel. No holding on any occasion. Our real world burn is increasing more and more these days compared to the plog. Or to put it more accurately, the plog estimated burn is being fudge factored more and more each day. So what has happened here? What models/perf penalty factors are they using? Honestly, no one knows anymore. The level of mistrust over such fuel planning is so high now, nothing less than 700Kg extra is considered for a flight of up to 4 hours even on a good day.