Here's a solution I just came up with last night.
My Pi3 is in a JBtek open sided case which had the fan on top.
That fan was too loud, so I went digging through my box of spare parts and found a very thin 40mm fan, and instead of mounting it on top of the case, I used a small brass spacer on one corner and mounted it between the SSD drive and SoC heatsink.
Back view showing the spacer (corner of the Pi board by the red LED):
With the original fan my temps topped out at 74C when maxing out the CPU. That's pretty warm, but still below the 80C throttling temperature. However, after switching to the thin fan mounted between the SSD and SoC heatsink my temps have dropped to a max of 55C (-19C).
If you don't have anything mounted over the top of your Pi you could do something similar with a larger fan.
My mind is like a browser. 27 tabs are open, 9 aren't responding,
lots of pop-ups...and where is that annoying music coming from?