Yes, I did notice that the speeds seemed what I thought were off. I don't remember exactly what I thought off was, but I do remember being disappointed that the Young hooked up through one Davis Console did not match up with a 6410 hooked up through wireless and side by side with another console. For the record, this was a very anecdotal observation and I was mainly comparing only the gust speeds, but it did warrant me calling Davis tech support (weren't helpful) and eventually buying a brand new 05106 (the one I tested this all with was the first one I bought used off e-bay) and wind tracker display.
I must add though that even with the current setup I have now (the new 05106, and I have been through multiple 6410's), the Young gusts are almost always lower. Not sure if this is due to overspin I have read about on the Davis. At low speeds <15-20mph, the two gusts generally seem to match within 1 mph. Once gusts get above 25-30mph, the Young is generally about 4 mph less than the Davis.
I am just trying to share this info to be transparent on what I have done, but I am not sure there was necessarily an issue, it definitely could have been one of my variables.
The good news is once I can get mine set up (which now I am itching to do more than any recent time), with all the time I have spent looking at the two displays live and remotely, I'll know right away if there is really a problem when comparing the Young to my 6410.
Back to your setup, can you try the leaf blower on the Davis anemometer on the same setting and see what you get compared to the 26mph the young produced?. Do you have a clear fetch? Or are there trees around that can hamper the wind speeds? Is the wind direction matching (due south is where the pigtail comes out of the base). Just thinking out loud of some things I would try.