It is minus 20 degree from overclocked, before my temps were around 57-60 now there are 37 to 40, both times with the same config 211. now the whole box feels cooler, the vrms are cooler, and the whole radiator is cooler, I think the readings are real.
nice, when I did something similar it didn't seem to do well without the shrouds is why I put them on the crossbar
maybe you have it at a better angle than I did
mine run pretty cool as well but 20c is a big drop