And:Went down a long rabbit hole of YouTube videos and HPD catalogs, and the common theme is the following;
1) Airflow really matters. Most of the hoods have extra vents. At the very least, they don’t have the rain shields.
2) They all have OE or OE style tube and fin intercoolers
3) They’re feeding aux oil coolers with fresh air that doesn’t interfere with radiator cooling.
4) Separate coolers for transmission fluid
Also we can't forget all these race cars don't have ACs. It's the single most effective cooling mod. The AC condenser sits in front of the radiator and increases the total air resistance - a lot less air travel through the engine bay because of it. The ultimate proof is the BTCC FK8 race car (pic below). It has 350bhp, stock-ish grill and stock hood with some laughably small lateral vents. It doesn't overheat, ever. But this would never work on a street FK8 with an AC, a stock crash bar and fans+shrouds. What I mean is that we can't easily translate race car solutions to our road going cars. We need much more extensive mods than them. And as soon as we get close to dealing with the heat issue, we bump the power level another 20-30% (race regulations don't allow them to do it!) and we have to go back to the drawing board haha.
Anyway, I agree completely with your observations. They are a common theme with the fk8 crowd. Large bar&plate ICs and front-mounted oil coolers have only made it worse.