Hmmm... I only have two data points
I started out with a simple "wrap of tape around screws" and was concerned with vortexes coming off sharp edges and so "hollowed out" a fan frame, radiusing everything.
As measured incredibly crudely by looking at the temp shown on my CPU diode - I saw no difference. I'd expected to see a drop, but would certainly have noticed a rise.
And... I'd also been concerned about the inside lip of the coolingworks shroud that I used (inner hole is 105mm or so - standard 120mm fan blade swept area diameter). The panaflos I used faired out in an oblong way to 130mm across the corners (less across the flats, of course - no "meat" there). So I carved the shroud to match. Again, no difference in CPU diode temps.
I suspect that the fact that I'm using these fans way undervolted makes a lot of this not matter - or my measurement technique is so crude that I'm not seeing the difference that's actually there. (The diode temp on this CPU does go up and down in lockstep with my room temp so I think I'd see a delta - but maybe not - hardly near your standards...)
Anyway, the next time I take this setup out, a squirrel cage is going in (whole new set of issues to learn about)
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