However nearby Denver has more cash-flowing opportunities and many more small MF properties for sale, although it's a highly competitive market with compressed cap rates currently as well.

On the rate compression, I wonder if population growth to the region will counterbalance any risk adjustment.

Far less exposure/down side risk and, if done right, not much compression to the upside! 

Are they suffering from the same cap rate compression as everything else these days?  

Yes, cap rates are definitely being compressed, just as they have been in apartments and self storage over the past decade.

Even if attempting to clear a french drain doesn't work...and it might not given it could be compressed or damaged by roots...

Spot on, @Timothy Chi, Eastern Washington was once a perfect market for cashflow investing (5-8 years ago), but cap rates have compressed and rents are rising, making it more difficult to find deals.

I’m seeing yields being compressed at breakneck speed over the last 6 months, especially this month.

If the numbers are RUN CORRECTLY and assuming all real market factors (like accurate rents, vacancy, R&M, capital improvements, etc) and there is cashflow at the end that allows me to absorb economic compression WITHIN that property's performance then I would not hesitate to move forward. 

You can boost ISO, to a point.Regarding RAW vs JPEG, JPEG will look better out of camera and for MLS/Zillow/Craigslist, the additional detail available in RAW is lost in compression to the sites anyways, plus there is more editing needed right of the top, and converting before uploading.The goal with all photos is to grab attention.